This has been happening with many of the ads but only the ones that pop out. They have been shifting in front of the top left of the screen and blocking all the quick links so that every time you go to drag your mouse out to them it enlarges. It never happens to me with any of the ads that do not have a mouse over enlarge.
Ads are one thing, but once they start to interfere with browsing they just become obnoxious. Getting bigger when I mouse over them is a real pain. The banner even when in its normal spot is right under the logout link. It pops up every time one of the mouse over adds are there, and it does not go away until I click the part to put it back. This usually causes me to have to drag my mouse around the ad so that I end up not making the same mistake twice. When it is shifted over to the left I have to refresh the page just to click the few links it covers.
Please do not allow this anymore or fix it if it is a bug. It is making your site unpleasant to visit.