Using the instruction from Install Gnome 3.6 On OpenSuse 12.2 | Muktware I performed the following to upgrade my desktop from Gnome 3.4 to 3.6 on my opensuse 12.2 x64 machine:

# zypper ar obs://GNOME:STABLE:3.6/openSUSE_12.2 GS36

# zypper mr -r GS36

# zypper dup --from GS36
Now my login screen and desktop background are corrupted. Everything else "seems" to be working fine once I log in.
I did see some error messages relating to the package evolution about something being broken - although not sure if it is related.
Does anyone have any suggestions how to fix this issue?