ok this might not have anything to do with the latest uxtheme patch, but on a vm install of xp sp3 with the uxtheme patche when it booted up the default Luna theme didn't have the wallpaper applied.. also my own msstyle theme which I've copied into the theme dir.. when applying it, the style changes but the wallpaper part doesn't... vey strange.. I hadn't noticed thisbefore.. and even checking on my own xp sp2 system.. applying different styles isn't applying the default wallpaper it normally would.. unless i manually set the wallpaper to apply via the wallpaper section

well any possible solutions I could look into would be good.. not too bothered about the current system not applying wallpapers..but def. want to fix the issue with my Unattended Winxp SP3 cd

If you've got any doubts about your patched uxtheme.dll, then you could try this one, I've just patched and see if it helps!