When I run certain gnome 3 applications (for example Documents and Clocks) I get to see the background instead of the application (see picture below). This happens in Ubuntu and Fedora and I updated to the latest version of Parallels Tools. Is there some setting I can change that solves this issue? I don't have any issues with Ubuntu (without running gnome shell). My system is an iMac late 2009 (ATI Radeon HD 4800 512mb).
