jost - 1:59 pm on Mar 12, 2013 (gmt 0)
Webmasters have reported that the text in many of their ad's have started using a teeny tiny font (screen shot verified), which is what is causing the massive drop is CTR.
This has not happened for Tablets, so tablet stats are not affected. I can verify, only my desktop stats are being hit by this google BUG.
Im going to try switching to Rich media ad's only until they fix this font BUG.