A little searching found this:

http://www.vbulletin.com/forum/showt...ting-on-forums

Apparently it's a known problem in Firefox 3.6, although I'm not having issues over here.

For diagnostic purposes, the following is my User Agent information:
Code:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.2pre) Gecko/20100314 Ubuntu/10.04 (lucid) Namoroka/3.6.2pre