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Created attachment 418480 [details]
A picture showing the artifacts that appear when the Firefox window is scrolled.

Description of problem:
When a window is placed at the bottom of the screen and the contents are scrolled, artifacts appear.

Version-Release number of selected component (if applicable):
Gnome 2.28.2

How reproducible:
Happens once in a while.

Steps to Reproduce:
1. Place window below taskbar
2. Scroll contents of window
  
Actual results:
Artifacts appear as parts of the window's contents repeat.

Expected results:
No artifacts should appear

Additional info:
Artifacts disappear when the windows are redrawn either by selecting something else, moving the window, or resizing the window.

*** This bug has been marked as a duplicate of bug 589956 ***