Getting Error Message

[timh]

Every time I choose widgets, regardless of what website i am accessing my computer freezes up and i get this message:

"widgets < website name - wordpress- mozilla firefox- (not responding)"

All other functions in Wordpress are working fine, but widgets wont respond. I have never had this problem before. All I get is the hour glass and no response. What really makes it unusual is that it's the same on all of my wordpress sites and several of them are on different IP's.

Any ideas on what could be causing this?

Thanks