The xdm init.d script needs a new use for an optional dependency. It needs to add "consolekit". You can find this in the Gentopia overlay (or the GNOME overlay). gdm when using PAM will communicate to consolekit to provide info about who's physically logged in at the machine. This replaces pam_console, which I'm sure lots of people will be happy to get rid of.
Cardoe, please feel free to make the change and revbump xinit.
Fixed in 1.0.3-r2. Thanks Donnie.