To reproduce:

Add appointments to TimelineView so that they create a vertical scrollbar. Scroll to bottom and click at the last appointment, you will see that the scrollbar will return back to the start and will hide for a moment

Workaround:

Use the following custom scheduler:

public class Myscheduler : RadScheduler
{
    public override string ThemeClassName
    {
        get
        {
            return typeof(RadScheduler).FullName;
        }
        set
        {
            base.ThemeClassName = value;
        }
    }

    protected override RadSchedulerElement CreateRadSchedulerElement()
    {
        return new MySchedulerElement(this, this.ActiveView);
    }

}

class MySchedulerElement : RadSchedulerElement
{
    public MySchedulerElement(RadScheduler scheduler, SchedulerView view)
        : base(scheduler, view)
    { }

    protected override SchedulerViewElement CreateViewElement()
    {
        if (this.Scheduler.ActiveViewType == SchedulerViewType.Timeline && this.Scheduler.GroupType == GroupType.None)
        {
            return new MyTimelineViewElement(this.Scheduler, this.View);
        }

        return base.CreateViewElement();
    }
}

class MyTimelineViewElement : SchedulerTimelineViewElement
{
    public MyTimelineViewElement(RadScheduler scheduler, SchedulerView view)
        : base(scheduler, view)
    {
    }

    protected override void UpdateVeticalScroll(float presenterHeight, float appointmentsMaxHeight)
    {
        base.UpdateVeticalScroll(presenterHeight, appointmentsMaxHeight + this.VScrollBar.Value);
    }
}

To reproduce:
1. Add several appointments:

 Random rand = new Random();
            for (int i = 0; i < 5; i++)
            {
                Appointment app = new Appointment(DateTime.Now.AddHours(i), TimeSpan.FromMinutes(45), "App" + i);
                app.BackgroundId = this.radScheduler1.Backgrounds[rand.Next(0, radScheduler1.Backgrounds.Count)].Id;
                this.radScheduler1.Appointments.Add(app);
            }
2. On RadButton.Click event try to change the PrintStyle and print the scheduler:
private void radButton1_Click(object sender, EventArgs e)
{
    SchedulerDetailsPrintStyle detailsStyle = new SchedulerDetailsPrintStyle();
    detailsStyle.PageBreakMode = PageBreakMode.Day;
    this.radScheduler1.PrintStyle = detailsStyle;
    
    this.radScheduler1.Print();
}

To reproduce: 
- Add mapping for the reminder property and try to save it in the database.

Workaround:
appointmentMappingInfo.Reminder = "Reminder";
appointmentMappingInfo.FindBySchedulerProperty("Reminder").ConvertToScheduler = ConvertReminderToScheduler;
appointmentMappingInfo.FindBySchedulerProperty("Reminder").ConvertToDataSource = ConvertReminderToDataSource;

 private object ConvertReminderToDataSource(object item)
private object ConvertReminderToDataSource(object item)
{
    TimeSpan? reminder = item as TimeSpan?;
    if (reminder != null)
    {
        return (int)reminder.Value.TotalMilliseconds;
    }

    return 0;
}

private object ConvertReminderToScheduler(object item)
{
    try
    {
        int value = Convert.ToInt32(item);
        if (value != 0)
        {
            return TimeSpan.FromMilliseconds(value);
        }

        return null;
    }
    catch
    {
        return null;
    }
}

To reproduce:
1. Double click over the scheduler to open the edit dialog.
2. Click the Recurrence button.
3. Check "all day event"
4. Select Yearly recurrence pattern , every January 1st
5. Confirm the appointment.
6. Navigate to the first occurrence, select it and press Delete key. Confirm the deletion.  You will see that the appointment is still visible. However, if you chose the "all day event" from the first edit dialog, everything works as expected.

To reproduce:

public Form1()
{
    InitializeComponent();

    Appointment a1 = new Appointment(new DateTime(2015, 03, 04, 10, 30, 0), TimeSpan.FromMinutes(30), "A1");
    Appointment a2 = new Appointment(new DateTime(2015, 03, 04, 11, 00, 0), TimeSpan.FromMinutes(30), "A2");
    Appointment a3 = new Appointment(new DateTime(2015, 03, 04, 11, 30, 0), TimeSpan.FromMinutes(30), "A3");
    this.radScheduler1.Appointments.Add(a1);
    this.radScheduler1.Appointments.Add(a2);
    this.radScheduler1.Appointments.Add(a3);
    DateTime currentDate = new DateTime(2015, 03, 03, 09, 00, 10);

    this.radScheduler1.FocusedDate = currentDate;
    SchedulerTimelineView timelineView = radScheduler1.GetTimelineView();
    timelineView.ShowTimescale(Timescales.Minutes);
    timelineView.RangeStartDate = currentDate.AddMonths(-3);
    timelineView.RangeEndDate = currentDate.AddMonths(3);
    timelineView.GetScaling().DisplayedCellsCount = 10;
}

Workaround: Use the date part only:
 DateTime currentDate = new DateTime(2015, 03, 03, 09, 00, 10);
 currentDate = currentDate.Date;

To reproduce:
- Bind the scheduler to the default SchedulerData.mdb
- Add an appointment like this:

this.radScheduler1.Appointments.BeginUpdate();
Appointment appointment = CreateAppointment();
this.radScheduler1.Appointments.Add(appointment);
this.radScheduler1.Appointments.EndUpdate();

- Save the database

If you try to set the AutoSize property to true at run time you will obtain the error illustrated on the attached screenshot.

To reproduce:

RadScheduler radScheduler1 = new RadScheduler();
SchedulerTimelineView timelineView;

public Form1()
{
    InitializeComponent();
   
    this.Controls.Add(radScheduler1);
    radScheduler1.Dock = DockStyle.Fill;

    Color[] colors = new Color[]
    {
        Color.LightYellow, Color.LightYellow, Color.Red,
        Color.LightYellow, Color.LightYellow, Color.Red,
        Color.LightYellow, Color.LightYellow, Color.LightYellow
    };

    for (int i = 0; i < colors.Length; i++)
    {
        Resource resource = new Resource();
        resource.Id = new EventId(i);
        resource.Name = "Room " + (i + 1).ToString();
        resource.Color = colors[i];
        this.radScheduler1.Resources.Add(resource);
    }
  
    radScheduler1.ActiveViewType = SchedulerViewType.Timeline;
    timelineView = radScheduler1.GetTimelineView();    
    
    TenMinutesTimescale tenMinutes = new TenMinutesTimescale();
    timelineView.SchedulerTimescales.Add(tenMinutes);
    tenMinutes.Visible = true;
    this.radScheduler1.GroupType = GroupType.Resource;
    this.button1.Click += button1_Click;
}

public class TenMinutesTimescale : MinutesTimescale
{
    public override int ScalingFactor
    {
        get
        {
            return 10;
        }
    }
}

private void button1_Click(object sender, EventArgs e)
{  
    timelineView.GetScaling().DisplayedCellsCount += 10;
}


Workaround:

public class MyElementProvider : SchedulerElementProvider
{
    public MyElementProvider(RadScheduler scheduler) : base(scheduler)
    {
    }

    protected override T CreateElement<T>(SchedulerView view, object context)
    {
        if (typeof(T) == typeof(TimelineHeader))
        {
            return new MyTimelineHeader(this.Scheduler, view, context as SchedulerTimelineViewElement)as T;
        }
      
        return base.CreateElement<T>(view, context);
    }
}

public class MyTimelineHeader:TimelineHeader
{
    public MyTimelineHeader(RadScheduler scheduler, SchedulerView view, 
        SchedulerTimelineViewElement timeLineViewElement) : base(scheduler, view, timeLineViewElement)
    {
    }

    protected override SizeF ArrangeOverride(SizeF finalSize)
    {
        List<SchedulerTimescale> allSortedScale = new List<SchedulerTimescale>();
        allSortedScale.Add(new SchedulerTimescale());
        typeof(TimelineHeader).GetField("allSortedScales",
            System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance).SetValue(this, allSortedScale);
        return base.ArrangeOverride(finalSize);
    }
}

public Form1()
{
    InitializeComponent();

   this.radScheduler1.ElementProvider = new MyElementProvider(this.radScheduler1);
    this.Controls.Add(radScheduler1);
    radScheduler1.Dock = DockStyle.Fill;

    Color[] colors = new Color[]
    {
        Color.LightYellow, Color.LightYellow, Color.Red,
        Color.LightYellow, Color.LightYellow, Color.Red,
        Color.LightYellow, Color.LightYellow, Color.LightYellow
    };

    for (int i = 0; i < colors.Length; i++)
    {
        Resource resource = new Resource();
        resource.Id = new EventId(i);
        resource.Name = "Room " + (i + 1).ToString();
        resource.Color = colors[i];
        this.radScheduler1.Resources.Add(resource);
    }
  
    radScheduler1.ActiveViewType = SchedulerViewType.Timeline;
    timelineView = radScheduler1.GetTimelineView();    
    
    TenMinutesTimescale tenMinutes = new TenMinutesTimescale();
     timelineView.SchedulerTimescales.Insert(0, tenMinutes); 
    //timelineView.SchedulerTimescales.Add(tenMinutes);
    tenMinutes.Visible = true;


    this.radScheduler1.GroupType = GroupType.Resource;
    this.button1.Click += button1_Click;
}

To reproduce: 

1. Add a RadScheduler, a RadSchedulerNavigator and a RadButton. Use the following code and run the project:

private void radButton1_Click(object sender, EventArgs e)
{
    SchedulerTimelineView timelineView = radScheduler1.GetTimelineView(); 
    this.radScheduler1.FocusedDate = new DateTime(DateTime.Now.Year,DateTime.Now.Month,1);
    timelineView.ShowTimescale(Timescales.Weeks);
    this.radScheduler1.SchedulerElement.UpdateCellContainers();
}

2. Switch to Timeline view and change the scaling to Hour.
3. Add and appointment and click the button. You will notice that the appointment is missing.

Workaround: change the FocusedDate after the scaling is changed.

To reproduce:
Appointment app = new Appointment(DateTime.Today.AddHours(18), TimeSpan.FromHours(10), "Test");  
this.radScheduler1.Appointments.Add(app);

SchedulerDayView dayView = this.radScheduler1.GetDayView();
dayView.RulerStartScale = 1;
dayView.RulerEndScale = 24;
dayView.DayCount = 2; 
this.radScheduler1.EnableExactTimeRendering = true;

To reproduce: follow the introduced approach in the following help article: http://www.telerik.com/help/winforms/scheduler-drag-and-drop-drag-and-drop-using-raddragdropservice.html 

When you maximize the form and return it to normal state, the appointment is rendered.

Workaround for Timeline view: after adding the dropped appointment you can refresh the scaling:

this.radSchedulerDemo.Appointments.Add(appointment);
this.radSchedulerDemo.GetTimelineView().ShowTimescale(Timescales.Days);

To reproduce :

1. Bind RadScheduler to data base. http://www.telerik.com/help/winforms/scheduler-data-binding-data-binding-walkthrough.html 
2. Specify the  AppointmentMappingInfo.AllDay property to the column in your data base table.
3. When starting the application, the all day appointments are shown correctly. However, if you try to drag the all day appointment to a new time slot and save the changes to your data base, the AllDay property is not stored.

Workaround: before saving the changes ,update the DataBoundItem's AllDay property:

Private Sub AppointmentDropped(sender As Object, e As AppointmentMovedEventArgs)
    Me.RadScheduler1.DataSource.GetEventProvider().Update(e.Appointment, "AllDay")
    SaveScheduler()
End Sub

To reproduce:
DateTime dtStart = DateTime.Today.AddDays(2).AddHours(10); 
DateTime dtEnd = DateTime.Today.AddDays(2).AddHours(12); 
Appointment appointment = new Appointment(dtStart, dtEnd, "TEST", "Description"); 
this.radScheduler1.Appointments.Add(appointment); 

System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("ar-SA");

Try to open the edit dialog.


Workaround: create a custom dialog that inherits  RadSchedulerDialog and implements IEditAppointmentDialog. Thus, you will be able to handle the whole edit operation.

public class Scheduler : RadScheduler
{
    protected override IEditAppointmentDialog CreateAppointmentEditDialog()
    {
        return new MyDialog();
    }

    public override string ThemeClassName  
    { 
        get 
        { 
            return typeof(RadScheduler).FullName;  
        }
    }
}

public partial class MyDialog : RadSchedulerDialog, IEditAppointmentDialog
{
    public MyDialog()
    {
        InitializeComponent();
    }

    Appointment appointment;

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e); 

        //an example how specify the start date
        RadDateTimePicker dtStart = this.Controls[0] as RadDateTimePicker;
        dtStart.Value = this.appointment.Start;
    }
   
    public void ShowRecurrenceDialog()
    {
        //ToDo
    }

    public bool EditAppointment(Telerik.WinControls.UI.IEvent appointment, Telerik.WinControls.UI.ISchedulerData schedulerData)
    {
        this.appointment = appointment as Appointment;

        return true;
    }
}

To reproduce: use the code snippet from the documentation: http://www.telerik.com/help/winforms/scheduler-views-time-zones.html

SchedulerTimeZone utcPlusOneTimeZone = new SchedulerTimeZone(-60, "UTC + 1");
this.radScheduler1.GetDayView().DefaultTimeZone = utcPlusOneTimeZone;

Woraround: set the time zone by using the SchedulerTimeZone.GetSchedulerTimeZones() list.

To reproduce: use the following code:

public Form1()
{
    InitializeComponent();
    
    Appointment recurringAppointment = new Appointment(DateTime.Now,
        TimeSpan.FromHours(1.0), "Appointment Subject");
    HourlyRecurrenceRule rrule = new HourlyRecurrenceRule(recurringAppointment.Start, 2, 10);
    recurringAppointment.RecurrenceRule = rrule;
    this.radScheduler1.Appointments.Add(recurringAppointment);
}

From the scheduler navigator change the time zone to any zone with "-". You will notice that some of the occurrences disappear.

Workaround:
 SchedulerBindingDataSource schedulerBindingSource = new SchedulerBindingDataSource();
schedulerBindingSource.EventProvider.ResourceMapperFactory = new MyResourceMapperFactory(schedulerBindingSource);

class MyResourceMapperFactory : Telerik.WinControls.UI.Scheduler.ResourceMapperFactory
    {
        public MyResourceMapperFactory(SchedulerBindingDataSource owner)
            : base(owner)
        { }

        public override Telerik.WinControls.UI.Scheduler.ResourceIdMapper GetResourceMapper(object dataSourceItem, PropertyDescriptor resourceIdDescriptor)
        {
            if (resourceIdDescriptor == null)
            {
                resourceIdDescriptor = GetResourceIdDescriptor(dataSourceItem);
            }

            return base.GetResourceMapper(dataSourceItem, resourceIdDescriptor);
        }

        private PropertyDescriptor GetResourceIdDescriptor(object resourceIdList)
        {
            string resourceIdPropertyName = ((AppointmentMappingInfo)this.OwnerDataSource.EventProvider.Mapping).ResourceId;

            if (string.IsNullOrEmpty(resourceIdPropertyName))
                return null;

            System.Collections.IList list = resourceIdList as System.Collections.IList;
            Type listType = resourceIdList.GetType();

            if (list == null && listType.IsGenericType && listType.GetGenericArguments().Length == 1)
            {
                Type[] genericArguments = listType.GetGenericArguments();
                PropertyDescriptorCollection resourceProperties = TypeDescriptor.GetProperties(genericArguments[0]);
                return resourceProperties.Find(resourceIdPropertyName, true);
            }
            else
            {
                PropertyDescriptorCollection resourceProperties = ListBindingHelper.GetListItemProperties(resourceIdList);
                return resourceProperties.Find(resourceIdPropertyName, true);
            }
        }
    }

To reproduce: 

1. Follow the steps for creating custom Appointment as it is demonstrated here: http://www.telerik.com/help/winforms/scheduler-appointments-and-dialogs-adding-a-custom-field-to-the-editappointment-dialog.html
2. Create a new Appointment and press Ctrl+C to copy the selected custom appointment.
3. Press Ctrl+V to paste. You will notice that the pasted appointment is from the default type, not the custom one.

Workaround:

this.radScheduler1.AppointmentsCopying += radScheduler1_AppointmentsCopying;
this.radScheduler1.AppointmentsPasting += radScheduler1_AppointmentsPasting;

private void radScheduler1_AppointmentsCopying(object sender, SchedulerClipboardEventArgs e)
{
    email = ((AppointmentWithEmail)this.radScheduler1.SelectionBehavior.SelectedAppointments.First()).Email;
}

private void radScheduler1_AppointmentsPasting(object sender, SchedulerClipboardEventArgs e)
{
    e.Cancel = true;
    if (e.Format == "ICal")
    {
        DataObject clipboardObject = Clipboard.GetDataObject() as DataObject;
        if (clipboardObject == null)
        {
            return;
        }
        string ical = Convert.ToString(clipboardObject.GetData(RadScheduler.ICalendarDataFormat));
        bool pasteResult = PasteFromICal(ical);
    }
}
 
private bool PasteFromICal(string ical)
{
    SchedulerICalendarImporter importer = new SchedulerICalendarImporter( this.radScheduler1.AppointmentFactory);
    
    SnapshotAppointmentsSchedulerData data = new SnapshotAppointmentsSchedulerData(this.radScheduler1, null);
    importer.Import(data, ical);

    ISchedulerStorage<IEvent> storage = data.GetEventStorage();
    if (storage == null || storage.Count == 0)
    {
        return false;
    }
    IEnumerator<IEvent> enumerator = storage.GetEnumerator();
    enumerator.MoveNext();
    TimeSpan pasteOffset = this.radScheduler1.SelectionBehavior.SelectionStartDate - enumerator.Current.Start;
    enumerator.Dispose();

    foreach (IEvent appointment in storage)
    {
        TimeSpan oldDuration = appointment.Duration;
        appointment.Start = appointment.Start.Add(pasteOffset);
        appointment.Duration = oldDuration;
        appointment.UniqueId = new EventId(Guid.NewGuid());
        ((AppointmentWithEmail)appointment).Email = email;
        if (appointment.RecurrenceRule != null && appointment.Exceptions != null)
        {
            foreach (IEvent exception in appointment.Exceptions)
            {
                oldDuration = exception.Duration;
                exception.Start = exception.Start.Add(pasteOffset);
                exception.Duration = oldDuration;
                exception.UniqueId = new EventId(Guid.NewGuid());
            }
        }

        if (this.radScheduler1.GroupType == GroupType.Resource)
        {
            appointment.ResourceId = this.radScheduler1.SelectionBehavior.SelectedResourceId;
        }
    }

    foreach (IEvent appointment in storage)
    {
        this.radScheduler1.Appointments.Add(appointment);
    }

    return true;
}