This question is locked. New answers and comments are not allowed.
Hi guys,
Recently, we found that while implementing the stylesheet references we introduced a bug, causing RadStyleSheetManager to not work properly in Medium Trust.
A build (trial version) with the fix is attached. Please, open a formal support ticket to obtain the dev build you're elligible to.
The next official service pack release (scheduled for the end of the next week) will contain the fix.