Workaround:
public Form1()
{
    InitializeComponent();

    this.radCarousel1.CarouselElement.AnimationFinished += CarouselElement_AnimationFinished;
}

void CarouselElement_AnimationFinished(object sender, EventArgs e)
{
    if (this.radCarousel1.Items.Count == 6)
    {
        radCarousel1.CarouselElement.AnimationFinished -= CarouselElement_AnimationFinished;
        this.radCarousel1.SelectedIndex--;
    }
}

Use the following code:

RadCarousel c = new RadCarousel
{
    Parent = this,
    Dock = DockStyle.Fill
};

for (int i = 0; i < 50; i++)
{
    c.Items.Add(new MyButtonElement("Button " + i));
}

c.VisibleItemCount = 3;

Start the application and click the buttons to switch the elements, you will see the exception

To reproduce: add a RadCarousel and try to add items at design time using the SmartTag.  If you try to add more than three items, you get an error: "Index was out of range.  Must be non-negative and less than the size of the collection.  Parameter name: index"

Add an option to disable the re-animation of RadCarousel on form maximize.

Resolution: Added a new boolean property EnableAnimationOnFormResize. When the property is set to false, the re-animation is disabled when form is minimized/maximized.

To Reproduce:
Add a RadCarousel - add less than 5 items - you can see that the behavior is incorrect

Workaround:
this.carousel.Items.Add(new RadButtonElement("Text"));
for (int i = 0; i < 4; i++)
{
    this.carousel.Items.Add(new RadButtonElement(){ Visibility = ElementVisibility.Hidden });
}

http://www.telerik.com/forums/using-a-radcarousel-with-a-variable-number-of-items-less-than-5

The SelectedItemChanged event is not firing when you click on arrows. Only the SelectedIndexChanged event is firing.

Resolution: 
The SelectedItemChanged event should be fire only if user click on the item and the ItemClickDefaultAction property is set to SelectItem mode

1. Add few RadImageItems with assigned images to them in RadCarousel
2. Try to remove the selected item upon a button click
= > the item is removed from the Items collection, but remains visible on the screen and remains in the Children collection

To reproduce:
- add carousel with few items in it
- subscribe to the mentioned events
- start the application = > one item is selected but the events are not fired.

FIX. RadCarousel - SelectedItem is not assigned when the control is started.

Resolution: 

Selected Items represents the Clicked by mouse item and this behavior is a desired behavior.

So it should be not populated without user click on an item:

Instead the users should use the SelectedIndexChanged event in order to detect the current item:

        private void radCarousel1_SelectedItemChanged(object sender, EventArgs e)
        {
            currentItem = radCarousel1.Items[radCarousel1.SelectedIndex];
        }

Same action with the next button runs smoothly.

FIX. RadCarousel - SelectedItemChanged event is not fired

RadCarousel not rotating when the AnimationToApply property is set (263070)

To reproduce: 
from tickets: 263070,258135 
1. Add radCarousel with 5 RadImageButtonelements
2. Set the AnimationsToApply property to Animations.Location 

Workaround: 
this.radCarousel1.CarouselPath.ZScale = 1000;
this.radCarousel1.OpacityChangeCondition = Telerik.WinControls.UI.OpacityChangeConditions.None;
this.radCarousel1.AnimationsToApply = Telerik.WinControls.UI.Animations.All;