I was getting at least 9 clicks a day for this ad group and all of a sudden I've recieved no clicks the last few days.
I can't think of any reason for this to happen except that I changed the display URL (not the destination URL) on my ads to read the same as the destination URL. Today I checked Google's affiliate sites and my ads do not show up anymore. But they do show up on Google and I'm still not getting any clicks! Would changing the display URL have anything to do with this?