I'm not seeing any square ones other than the ones that sit on the right, under the drop-down areas.
Which banner ad area? the one on the bottom of the page, or the one on the top? On the main page, or on comics' pages?
Actually, it's probably a case of a specific ad being wrong- is it just one ad (if so, which) or lots of them? The ads are region-specific, so perhaps that's why I'm not seeing any of them. In the past, if it's just one ad that's causing a problem, we can get it removed from the rotation. We have to know which ad it is though.
(Man, there are so many ads on DD... usually I just have adblock on so I don't see this stuff)
Skool is prolly right. Sometimes the formatting can temporarily mess up though too with the ads. Maybe that's because of a square ad or maybe the html just goes screwy sometimes due to something wrong with the Javascript in those ads?