For me, an ad in a post will bleed over the post IF it has a quote long enough to get to the right edge of the page. It only bleeds on the quote, as if the quote can't wrap around the ad and the poster's text can.
I'm getting blank spots about 1/5 screen wide just past the middle of the screen and 1/2 to more than a screen high. Makes reading the posts a little hard when some of it is missing.