Comment # 18 on bug 1003822 from Dominique Leuenberger

RC2 should be coming out soon - I once managed to get to a system that behaved
pretty much the same as your log indicated - which helped us fix one issue like
that.

A 'way' to verify if this is the same issue we see here:
* On the login screen, chose a SLE Classic session (instead of GNOME) -> does
it login?
* On next login, it should be possible to use 'GNOME' (normal session) again.

If this is indeed the case here, then RC2 comes with the cure for this issue