Text-Link-Ads Lost Rankings

Text-Link-Ads stopped ranking for their main keywords a few months ago. A number of people have suspected that there was some sort of penalty enacted by Google, but there has been no evidence as of yet. One new post suggests that it might have actually been a proxy hijack that caused the problem. Matt Cutts added a comment to the post stating:

"I know for a fact that a proxy was not the root cause of this."