Description of problem:
Preference changes are not saved because the only way to close the prefrences
pop-up is to press "Cancel" or F4

Version-Release number of selected component (if applicable):
1.9.8 

How reproducible:
Every time

Steps to Reproduce:
1.Select Edit->Preferences
2.Change some preference value
3.Click the O.K. button
  
Actual results:
The button shows the "cklicked on" action, but the window is not closed.

Expected results:
The window should close after saving the preference change(s)

Additional info:
This problem was noted on a prior release, but not reported.

Specifically, I was trying to turn off the "Auto refresh on start" option so I
could try a different repository set.