ui tabs bug - menu goes wonky and stops working

ui tabs bug - menu goes wonky and stops working

I have implemented jqueryui tabs.  This works fine on all of the machines, (different browsers, operating systems) with the exception of one computer with firefox.  After clicking a few tabs on the menu one of them will collapse and not show the content inside the tab, even though that tab is active.  After clicking another tab it will then show two tabs as being active, and so on.

I don't know where I should be looking to resolve this issue.  I have several installations of winxp with firefox that don't have this issue.  On this machine it runs fine in ie.

If this was happening on all the machines I could fix it, but given that its just one I'm really at a loss.  

I apologize in advance if this is completely unrelated to jquery, I'm just not sure where to begin troubleshooting this particular users machine.

Any suggestions?