We don't have any known issues with InternalsVisibleToAttribute. If you still have this issue you can try to refresh the code analysis (there is a command for that in the JustCode menu).
If this doesn't fix this issue, can you give me more info about your specific project structure or send me an example solution where you reproduce that?
All the best,
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!