I see them on the 350 x 250 ad unit. There is a box situated to the right of a text ad, with a stocky arrow pointing left to the ad. One boxy arrow per ad, so it forms a column of boxy arrows. I created a channel to measure the CTR and earnings for comparison.
Anyone else measuring performance of ad units with visible boxy arrows?
I'm getting them consistently anytime text ads are displayed, but I'm not assuming they're running consistently network wide for every site vistor. Nevertheless, I'm still going to measure it to see if there's a plus or negative change.