Oooh I've noticed that too! I never noticed that it was due to one specific ad, just that sometimes I'd have to scroll ALL the way to the right to read the boards. I'll pay more attention to the ad/ads that are doing it.
When you see that ad again, can you please right click it, see what it says as url in properties and please paste it here? I haven't see it hapenning - must be one of the ads delievered by our networks. If I can track it down to which network and which ad, I can a. switch off the ad and b. report the problem.
I've seen the same thing. I just refresh the browser to get rid of it lol. I thought that hub had done something weird when he reformated the computer... nice to know it wasn't him after all. I guess I should go apologize