add/remove software option crashes in centos

Running centos linux version 5.5. When I click on the "Applications->Add/Remove Software" option, the window fails to come up. I have internet connectivity and the firewall is disabled.
When I do a "sudo yum list updates" from a terminal window, it completes successfully.
opikeAsked:
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opikeConnect With a Mentor Author Commented:
Rebooting resolved this.
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opikeAuthor Commented:
When I run pirut from the command line I get the following error messages:

Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

Unable to import modules.  Maybe you're not running under X?
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