It's more likely to be the other way around. I just took a fresh copy of Firefox 3.6.11 with nothing but AdBlock Plus installed and the same problem occurred. Noticing the NoScript extension in pipes' screenshot, I tried installing that, thinking that perhaps it would fix the problem, but no such luck.
What subscription(s) are you using with AdBlock? I tried EasyList and Fanboy's List but there was no difference between the two.