I've enabled my second monitor, works great (even though I don't want to use it, but that's another matter)
Now, the background on both displays is... not what it should be, i.e. the background picture from the selected theme. The primary display is something blackish (black and grey stripes), and the secondary is just black.
Tried changing themes, with no effect (on the background, the rest of the UI changes correctly).
EDIT: Card 1 is a Radeon 4650, 1GB, card 2 is a 4350, 512MB. Driver is 9-11 (or maybe new, Windows Update did some updating). Manually setting the background doesn't work either.
Windows 7 is the x64 variant. Box has 4GB of memory. CPU is an Athlon II X2 245. No overclocks.
EDIT: Started the performance check (updating "Windows Experience Index") and suddenly, both minitors show the manually set image. *headscratch*
Had a reboot while running the test, and on restart, it works perfectly. One could think I forgot a reboot, but why did the performance test seem to fix things, then?