i would like the color corruption being fixed, too...
but i think i'm the only one that still gets the Xorg hang when logging off with GDM!!
i would like to be fixed, too.
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There is an option for GDM to kill the X server when you logout, i was having the same issue but on KDM and with the option it does not hang anymore, you should try adding the following to your gdm.conf:
AlwaysRestartServer=true
i saw this from here, i hope that works for you, have a good day.