Desktop picture always defaults to stock blue background

SOLVED: I found and trashed the desktop pictures database, fittingly called "desktoppictures.db", chose the desired picture in the preference pane, then restarted (the db file is automatically rebuilt). That file was in the User directory, ~/application support/dock/ -- or something very much like that (I'm on a different computer ATM).

Thanks again, K

Thanks BDAqua,

Following your directions, I've determined that the problem is user-specific. So what does that suggest, or what should be the remedy? I don't believe I want to abandon that "User," as I have heaps of audio software, some of which that may be tied to that identity (the various copy protection schemes work in mysterious ways).

– K