Description of problem:
After unlocking the screen saver the desktop is displayed as a black screen, no
widows or icons are drawn on the screen.

Pressing ctrl-alt-arrow will display the workspace selection box. Switching to a
different workspace will display the same black screen with nothing displayed on
it. The workspace selection box does display any applications that were open
before the screen saver turned on. 

Pressing alt-tab displays the application switch box, with all the applications
in it. Switching applications seems to work, but it does not affect what is
displayed.

Version-Release number of selected component (if applicable):
xorg-x11-server-Xorg-1.1.1-48.26.el5_1.5

How reproducible:
Always

Steps to Reproduce:
1. Login to X
2. open a few apps
3. Select System->Lock Screen
4. Unlock Screen Saver
5. It is all painted black.
  
Actual results:
There is no desktop displayed.

Expected results:
Desktop should be displayed.

Additional info:
Gnome desktop, Nvidia 7600GT, NV driver, bog standard single monitor configuration.