Today all numbers in my AdWords campaigns dropped to absolute zero. Usually 300-400 clicks/day. I haven't even looked at the UI or made any AdWords changes in at least a week. No billing alert or any other alert in the UI that I can see. Credit card is wide open. Website is up and receiving normal organic Google traffic. Any ideas?
Did you check your adwords clicks from Google Analytics? For the past week I have noticed that adwords has been up to 12 hours behind in posting adword statistics, instead of a few hours like they normally do; however analytics is always very quick in reporting adwords traffic.