The thing is, I had it working directly after I upgraded from 8.40 to 8.42, but I managed to destroy compiz somehow. Anyway, I was running Gutsy beta (fully updated) and I needed a reformat due to me emigrating and fully removing Windows.

And you know what, now it works again.

Edit: However, the errors still occurs in the Xorg.0.log so I guess it's not related after all.