I installed the Silverlight 5 VS 2010 tools and the 64-bit Developer runtime and now I get a System.AccessViolationException when I do a specific action. The projects are st
There is a Microsoft Connect bug report for the same problem that we submitted a couple of hours ago. Please, vote so that it could be fixed as soon as possible.
RadComboBox already contains a workaround so please, check the latest internal build under your account and let us know if the problem persists. Here is the Telerik forum thread about the same problem.
I hope this helps.