Description of problem:
As a user, not in root console, I cannot run update process.
Every time I try to run gpk-update-viewer it crashes, not depending on how I run
it, is it from Main Menu or by clicking Show Updates in PackageKit Update Applet.

Version-Release number of selected component (if applicable):
gnome-packagekit.x86_64                  0.1.12-12.20080430.fc9
yum-packagekit.x86_64                    0.1.12-13.20080522.fc9

How reproducible:
65% times when I do updates on Fedora 9. Sometimes it works and prompts me for a
root password in window, but usualy not, it crashes before. All I can do is to
log as root and run "yum update" or gpk-update-viewer manually. 

Steps to Reproduce:
1. click on Show Updates in PackageKit Update Applet or use Main Menu >
Administration or type in terminal gpk-update-viewer
2. watch as small gray window entitled "Update System" shows up for a second
3. crash
  
Actual results:
After clicking on Show Updates in Applet small window appears and disappears.

Expected results:
After clicking on Show Updates in Applet updates are displayed. And one could
choose what to do than.

Additional info:
I am sending gpk-update-viewer-bugreport.txt in attachment