Thanks for the additional information guys. Yeah, the fact that both of you are having issues rules out the browser... What style/theme are you guys using on the forum? Dark or Crystal?

I created a test thread and did some quick replies using both themes and didn't have any issues, so not sure if it is the theme, just curious if you both are using the same one and I can dig deeper. If not, I think it is an AJAX issue... does that pop-up asking you to stay or leave come up right-away or after a few seconds?

I did do some general maintenance stuff in the backend of vBulletin to see if maybe that will help... I flushed the system cache, repaired tables and updated a few out-of-date templates... not sure if any of that could help but FYI.