[Gnome3.6] GDM Login Problems

I just upgraded to gnome3.6 and now gdm is broken in the following way.
If I select my user, the screen freezes for a couple of seconds and then displays:
"Authentication Failure"
If I type my username manually in gdm, everything works fine.
The following is written to gdm's log file:
    JS ERROR: !!!   Failed to start verification for user
    JS ERROR: !!!     message = '"Timeout was reached"'
    JS ERROR: !!!     fileName = '"/usr/share/gnome-shell/js/gdm/util.js"'
    JS ERROR: !!!     lineNumber = '208'
    JS ERROR: !!!     stack = '"0 anonymous("result" = [object _private_Gio_SimpleAsyncResult], "obj" = [object _private_Gdm_UserVerifierProxy])@/usr/share/gnome-shell/js/gdm/util.js:208
According to the commit message of the code that throws the exception, this error was thrown because of a DBus error.
https://mail.gnome.org/archives/commits … 09038.html
I'm using systemd.
Any ideas what is going wrong?

Please try to reduce the number of users in /etc/passwd, /etc/shadow. In Fedora 18 running on an old, slow desktop PC with Gnome 3.6.2, the username was finally accepted after removing approx. 1100 accounts, leaving only 60 accounts.

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