Here is some sample code:
Imports Telerik.WinControls Imports Telerik.WinControls.UI Public Class RadForm1 Private Sub RadForm1_Load(sender As Object, e As EventArgs) Handles MyBase.Load RadOverlayManager.Show(Me) For x = 0 To 1999999999 Next RadOverlayManager.Close() RadMessageBox.Show("You will never see this.", "Nope", MessageBoxButtons.OK, RadMessageIcon.Info) End Sub End Class
What you'll see is, the overlay will appear and disappear as expected. However the radmessagebox will never appear.
If you comment out the overlay lines, then the message box will appear.
Looks like a threading issue, but I'll leave that to the professionals to figure out. =)