This may be a bit old for this thread, but I'm getting the same thing only with a slight twist. It hits me whenever I hit my back arrow causing me to have to hit it twice to return to the previous screen. If I pull down the history arrow at the side it even shows the "adframe.php" as the immediately previous destination.

This doesn't happen ALL the time, but it happens more often than not. I also noticed that at the point this started happening to me was about when I started not being able to read more than one or two of the latest posts under the "Show unread posts since last visit" option.

Just thought you might lie to know Vicky... Good luck.