This is somewhat related to Jorn's post here
In the previous release (2011.1.0315), the RadWindow had a shadow around the edges. In the latest release (2011.2.0712.1040), this shadow is gone. See the "before" and "after" screenshots for details.
(Sorry, just realized I got the "before" and "after" screenshots reversed. The one labeled "before-2011-1" is actually after-2011-2; and vice versa.)
The shadow effect looks better to me. Is there a way to bring it back?