call to gdmflexiserver in /etc/gdm/PreSession/Default causes gtk setuid warning

I got the same problem...

(process:4853): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.

(process:4909): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.
/etc/gdm/Xsession: Beginning session setup...
/etc/X11/Xsession.d/40guidance-displayconfig_restore: 11: /usr/bin/displayconfig-restore: not found
SESSION_MANAGER=local/kmos.homeip.net:/tmp/.ICE-unix/4838
Initializing gnome-mount extension

(gnome-panel:5424): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -3 and height 24
Unable to open desktop file file:///home/kmos/Desktop/aterm.desktop for panel launcher: No such file or directory
Unable to open desktop file file:///home/kmos/Desktop/amsn.desktop for panel launcher: No such file or directory
Unable to open desktop file file:///home/kmos/Desktop/gegl-00066b05b7.desktop for panel launcher: No such file or directory

I have the same:

(process:7629): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.

(process:7646): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.
/etc/gdm/Xsession: Beginning session setup...
export DESKTOP_SESSION='default'
export DISPLAY=':0'
export GDMSESSION='default'
export GDM_LANG='en_US.UTF-8'
export GDM_XSERVER_LOCATION='local'
export GNOME_KEYRING_PID='7590'
export GNOME_KEYRING_SOCKET='/tmp/keyring-HEyHCf/socket'
export HOME='/home/m1k'
export LANG='en_US.UTF-8'
export LD_LIBRARY_PATH='/usr/lib/oracle/10.2.0.3/client/lib:'
export LOGNAME='m1k'
export MOZ_DISABLE_PANGO='”0″'
export PATH='/home/m1k/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
export PWD='/home/m1k'
export SHELL='/bin/bash'
export TNS_ADMIN='/usr/lib/oracle'
export USER='m1k'
export USERNAME='m1k'
export WINDOWPATH='7'
export XAUTHORITY='/home/m1k/.Xauthority'
export XDG_DATA_DIRS='/usr/local/share/:/usr/share/:/usr/share/gdm/'
export XDG_SESSION_COOKIE='c43e46cf3166ed74c056ed004638f100-1192443406.137057-1310978156'
/etc/X11/Xsession.d/40guidance-displayconfig_restore: 11: /usr/bin/displayconfig-restore: not found
No profile for user 'm1k' found

can you confirm it goes away if you comment the two lines for gdmflexiserver in /etc/gdm/PreSession/Default ?

Thanks for the bug report. This particular bug has already been reported, but feel free to report any other bugs you find.

I've added a comment to #136529.

These lines do cause those errors, however they don't appear to be responsible for the login problems.