Hey tony, thanks for the reply. I found these demos from this site at the url below and the problem actually occurs there as well.

http://www.trirand.com/blog/jqgrid/jqgrid.html

If I go to “New in version 3.6” > “New API” and widen a few columns so the scrollbar appears and then use it to scroll the problem still occurs.

I'm using Firefox 3.5.8 and I was using Firefox 3 a few months ago and this problem occurred then as well.