Workaround: set the RadRibbonFormBehavior1.AllowTheming property of the form to false

public class RadForm1
{
	public RadForm1()
	{
		InitializeComponent();

		this.RadRibbonFormBehavior1.AllowTheming = false;

	}
}

To reproduce:
- Create a RadForm with a public label in it. 
- Inherit the new form and change the label text.
- Open the second form at design time - the file status is changed to modified.

To reproduce:

public Form1()
{
    InitializeComponent();

    RadMessageBox.Instance.AutoSize = true;
}

private void radButton1_Click(object sender, EventArgs e)
{
    string msg = string.Format("Test", (sender as RadButton).Name);
    RadMessageBox.Show(msg, "Error");
}

Note that the size of  RadMessageBox is adjusted automatically to display the whole content. Hence, it is not necessary to set the RadMessageBox.Instance.AutoSize property to true.

To reproduce: 
1. Use the following code snippet: 
RadMessageBox.Show("RadMessageBox Some message box text", "Caption", MessageBoxButtons.OK, RadMessageIcon.Error);
2. The text is not aligned with the icon

To reproduce:

1. Add a RadForm with a RadButton and a RadGridView.
2. Use the following code snippet:
 public Form1()
        {
            InitializeComponent();

            this.AutoScroll = true;           
            this.radGridView1.Location = new Point(10, 500);                   
        }
3. Please refer to the attached gif file.

Workaround:

Use RadScrollablePanel and dock it inside the form.

For the time being to show the grid I would recommend you to use an empty RadStatusStrip.

To reproduce:
- Create blank WinForms RadForm Application.
- Set WindowState property to Maximized.
- Add RadGroupBox to the form. Set equal space on all sides.
- Anchor the group box to all sides.
- Launch application - spacing around outside of group box is incorrect.
-  Restore form to normal size - spacing around group box is incorrect.

Workaround:
radGroupBox1.Dock = DockStyle.Fill;
radGroupBox1.GroupBoxElement.Margin = new Padding(20);

To reproduce:
public partial class Form1 : RadForm
{
    public Form1()
    {
        InitializeComponent();
        this.IsMdiContainer = true;
    }

    private void radButton1_Click(object sender, EventArgs e)
    {
        RadForm childForm = new RadForm();
      
        childForm.Text = "MDI Child " + DateTime.Now.ToShortTimeString();
        childForm.MdiParent = this;
        childForm.WindowState = FormWindowState.Maximized;
        childForm.Show();
    }
}

To reproduce:
- Create new project.
- Make the default  form to inherit RadForm.
- Start the application and maximize the form.
- You will notice that a few pixels are displayed on the right monitor as well.

Workaround:
var screen = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
this.MaximumSize = new Size(screen.Width, screen.Height);

Second Workaround:

public Form1()
{
    InitializeComponent(); 

    this.SizeChanged += Form1_SizeChanged;
}
 
private void Form1_SizeChanged(object sender, EventArgs e)
{
    if (this.WindowState == FormWindowState.Maximized)
    {
        this.Region = null;
    }
}

To reproduce:

private void radButton1_Click(object sender, EventArgs e)
{
    Application.Exit();
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    RadMessageBox.Show("Do you want to exit?", "Confirmation", MessageBoxButtons.YesNo);
}


Workaround: Show the RadMessageBox first and then call the Application.Exit method according to the DialogResult.

DECLINED: 
When Application.Exit() is called it iterates through all forms and for each of them calls the FormClosing event. Currently the RadMessageBox is shown in a new form. So in this case during the iterating forms collection a new form is added and this causes the exception "Collection was modified; enumeration operation may not execute.". 
This is expected behavior and there are two possible solutions to prevent application from throwing exception: 
- Use this.Close(); to close the application.
- Make your checks, show RadMessageBox and after that, if needed call Application.Exit(); 

Please refer to the attached screenshot.

Workaround: use a RadForm without RadRibbonFormBehavior and hide the FormElement.TitleBar.

When the form border style is set to none the form still has minimum width.

To reproduce:

Create a RadForm and use the following code:

public Form1()
{
    InitializeComponent();

    var theme = new Telerik.WinControls.Themes.Windows7Theme();
    ThemeResolutionService.ApplicationThemeName = theme.ThemeName;// "Windows7";
    this.AllowTheming = false;
}

Start the application on Windows 7, you will see that the close/minimize/maximize buttons cannot be clicked.

Workaround:

Do not set the AllowTheming property or set it to true

To reproduce:

Show RadMessageBox as follows:

RadMessageBox.Show(this, "מסר כלשהו", "Caption", MessageBoxButtons.OKCancel, RadMessageIcon.Error, MessageBoxDefaultButton.Button1, RightToLeft.Yes, "מסר2 כלשהו");

Open the details button and you will see that the text is כלשהו מסר2

To reproduce:

Create a RadForm and set the property as follows:

public Form1()
{
    InitializeComponent();
    this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
}

Workaround:

Set the ShowIcon property to false:

public Form1()
{
    InitializeComponent();
    this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
    this.ShowIcon = false;
}

To reproduce:

1. Open a RadForm
2. Maximize the form.
3. Restore the form. Then we can see odd line on the bottom of title bar / top of the form.  If you resize the form (make it bigger), new visible areas of form doesn't contain this weird line.

Workaround:
protected override void WndProc(ref Message m)
{
    FormWindowState currentWindowState = this.WindowState;
    base.WndProc(ref m);
    if (currentWindowState == FormWindowState.Maximized && this.WindowState== FormWindowState.Normal)
    {
      
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
    }
}      

Workaround: use RadRibbonForm instead or set minimum and maximum size