I don't use Xinerama and also have experienced the problem, so it seems to be a Nvidia issue (at least, many posts I've seen seem to have Nvidia hardware) that is triggered off by more than just Xinerama.
I don't use Xinerama and also have experienced the problem, so it seems to be a Nvidia issue (at least, many posts I've seen seem to have Nvidia hardware) that is triggered off by more than just Xinerama.