Could you take some screenshots? I'm also using Chrome but haven't seen this problem. It could be your connection speed. Either way, screenshots would help! Especially several on different pages.

Thanks to GrandMasterD for my sig!
Will do :3
Main Page As seen from the scroll bar, no more of the page was loaded :/
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Every instance actually has the same ad. I also just noticed that there is a second, different F&F6 ad, which has video but does not cause the problem, so it seems the ad here does cause it every time. I've had it occur with some other movie ads that are no longer displayed on Mobafire. I have a couple of streams up atm, but I've had the problem occur when Mobafire is the only tab. Could it be speed? I don't know much about these internet things.
Main Page As seen from the scroll bar, no more of the page was loaded :/
Edit Post
Preview Post
Forum Thread
Every instance actually has the same ad. I also just noticed that there is a second, different F&F6 ad, which has video but does not cause the problem, so it seems the ad here does cause it every time. I've had it occur with some other movie ads that are no longer displayed on Mobafire. I have a couple of streams up atm, but I've had the problem occur when Mobafire is the only tab. Could it be speed? I don't know much about these internet things.
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Maybe it's not linked to the ads, but it only ever occurs when video ads load, never with static ones, although it doesn't occur 100%. When I first tried to create this thread no editor appeared, when I reloaded it I had the same ad but the editor did appear. And then it happened on four consecutive occasions when I previewed this thread and wanted to publish :/
To add some more detail, it seems to be movie ads which do it. The WoW ad is fine, as have been various detergent ads, despite all being video ones.
edit: Oh yeah, I'm using Chrome. Dunno if this occurs on other browsers.