Description of problem:
Connecting to a RHEL5.8 system using ssh with X forwarding, running gnome-system-monitor and terminating it results in it failing to start after starting a new session

Version-Release number of selected component (if applicable):
gnome-system-monitor-2.16.0-4.el5

How reproducible:
Always 

Steps to Reproduce:
1. ssh -Y rhel5.8 system
2. $ gnome-system-monitor
3. terminate it (ctrl+c)
4. try running and terminating a few more times (should work so far)
5. there should be a gnome-system-monitor socket in /tmp
6. $ exit (note that the ssh should hang by now and needs to be terminated)
7. reconnect to the same machine 
8. $ gnome-system-monitor (should start)
9. terminate again
10. run again
  
Actual results:
gnome-system-monitor doesn't start


Expected results:
it starts