It could be that it is now out of the ad rotation, or that the people that didn't get the popup just happen not to hit it, etc. I've only seen it happen once, while I was not logged in and using the new style of the board. (Last week if I recall) As I mentioned before, I was using OS X (on an Apple G4 powerbook) when I saw the pop-up. It behaved differently as well. It hid the Main firefox window and only showed the pop-up part. It was trying to get me to click the link which was to a windows binary. Of course this would not have done anything since I wasn't using windows, but the popup was still annoying. I would agree that it would turn new non registered users away if it happened to them. It's not that big of a deal to me but if others notice the same behavior it might be worth looking into. I only mentioned it because I saw someone else also saw it.