New code, both before and after the size change.
Other than the border the other settings are fine, colour, font size etc. That default blue border though looks so terrible that I'm considering removing the unit altogether for a while. ctr plummeted since this glitch / test anyway.
I wonder if it's only happening to certain sizes, I had been using 160 x 600, now using 120 x 600. Both show borders.
The only other ad I have on those pages is 1 link unit that hasn't (as far as I've seen) had any tests preformed on it but I do remember a thread not too long ago where someone noticed the ad page after the link unit had it's colours changed.