zero CPM

[vevs]

few weeks ago some of my sites had nice CPM, and for about few days the CPM was over 100%. I contacted google telling them that it was not me clicking on my ads and they replied that they will monitor the issue. Few days after that my CPM dropped to 0% and it is so since then. My ads display on my web site and I tried to click on one of them but my CPM is still 0%. Any ideas?
thanks

[hunderdown]

You mean CTR, not CPM, I'm assuming.

First of all, you should not click on your own ads. It's very likely that Google detected the self-click and discarded it. They may not mind one, but don't do it again.

Second, how much traffic do you get, and from what sources? With low traffic it is possible to get wild swings of CTR.

Third, any changes in the ads you see on your pages?