User-Agent: Mozilla/5.0 (X11; U; Linux i686; de; rv:22.214.171.124) Gecko/20090803 Fedora/3.5.2-2.fc11 Firefox/3.5.2
After login from gdm to a xfce desktop, the xfce4-session does start lots of (i.e about 100) xfwm4 window managers in parallel. Therefore it takes about 10-15 minutes for the Desktop to complete (showing "Starting window manager" in splash screen). In summary, a few 1000 xfwm4 processes gets started and will exit immediately since there is already another window-manager running (of course, the first one of these xfwm4).
Also lots of messages in ~/.xsession-errors like:
** (xfwm4:16768): WARNING **: Another Window Manager is already running
As a workaround, i have renamed "xfwm4" to "_xfwm4", so xfce4-session still tries to call the (now non-existing) xfwm4 binary a few thousand times, but this takes only about 5 minutes to complete.
Steps to Reproduce:
1. login to xfce desktop from gdm
2. ... wait.
xfce Desktop takes lots of time to complete, starting (and exiting) 1000's of xfwm4
xfce Desktop (e.g. xfce4-.session) should start xfwm4 only once.
This is the same issue as bug 512522
(you can find the link to the upstream bug there as well).
*** This bug has been marked as a duplicate of bug 512522 ***