I apologize for this problem. We found the problem recently and it was fixed in our latest internal build. You can either get our internal build or wait for the next official release (Q3 2010 - beginning of November). Alternatively you can disable the Visual Aids feature in the options and then send feedback.
Don't ask how Visual Aids and Send Feedback are related. It was one hell of a strange bug :)
the Telerik team
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