I have Xubuntu 11.10. After suspending the computer - the desktop background becomes black - right-click menu item "Change background image" stops working - the menu also has different style. I have MurrinaCrystalHuman appearance (orange) and Sassandra decorations. The menu looks more like GTK apps, with dark-blue menu highlight.
Sounds like xfsettingsd crashed and possibly xfdesktop. It usually means a hardware problem with suspend. Does this still happen?
Marking resolved due to lack of response. Feel free to reopen if it happens again.