Resolved!
After more desperate searching, I found that one of the theme installers overwrote the Registry value that specified the background screen - it was \Application Data\Home\startmenubg.bmp and the app changed it to it's own .gif. When I removed the theme, the Registry setting (including many others) was not reverted.
The theme was "Vista Aurora". I recommend being careful with that theme and the Cingular 2125...
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