http://developers.de/blogs/damir_dobric/archive/2011/11/10/metro-catastrophic-failure-exception-hresult-0x8000ffff-e-unexpected.aspxWelcome back the the world of COM errors. If you get this one, it means you just have tried to to access one control from none-UI-thread. Isn’t that one step back in the evolution of Microsoft development platform?enCommunityServer 2008 SP1 (Build: 30619.63)