window??

As each page loads, particularly the main forum page or the "view since last visit" page, there appears to be a smaller window opening and then closing like a pop up. Does FTR have pop ups that my pop up blocker or adblocker is stopping or is there something in the forum code that was removed but not completely.

Not sure if this makes sense or not. It would be hard to get a pic of it.

edit: windows 7, chrome