Random bitmap data shows up in the background of progress bars in the
lightspeed theme. (Resizing the parent window changes the garbage
patterns.) The panels in the 'Detailed System Info' dialog in 'System Info'
best show this problem. Also, the edges of tabs seem to not be redrawn
properly when paging through tabbed dialogs.
*** Bug 21869 has been marked as a duplicate of this bug. ***
*** Bug 21870 has been marked as a duplicate of this bug. ***
Only thing I could do here would be to remove the theme. The quality
of the themes outside of the offical gtk-engines tarball is pretty
low. (We include a number of these in the gtk-engines package.)