Description of problem:
Can not start yumex from menu or terminal.
It is possible to run yumex from another client with ssh connection ( ssh -Y floki.n.n ).
When started from terminal then window for root password appears. 
After typing password and enter, then nothing happes.  

Version-Release number of selected component (if applicable):
yumex-2.0.4-1.fc9.noarch

How reproducible:
always

Steps to Reproduce:
1.
Start yumex from terminal.
( first after login in then root window appears, not second time )
2.
3.
  
Actual results:
[floki@dhcppc3 ~]$ yumex
No protocol specified
Traceback (most recent call last):
  File "/usr/share/yumex/yumex.py", line 29, in <module>
    import gtk,gobject
  File "/usr/lib64/python2.5/site-packages/gtk-2.0/gtk/__init__.py", line 79, in <module>
    _init()
  File "/usr/lib64/python2.5/site-packages/gtk-2.0/gtk/__init__.py", line 67, in _init
    _gtk.init_check()
RuntimeError: could not open display

Expected results:
Se yumex 

Additional info:
Same result for starting as root. 
[root@dhcppc3 ~]# yumex