Hello! I have been signed up with the ad network since the 28th. On the 28th and March 1st, I recieved some impressions. I have not, however, recieved any since then. Coop seems to validate just fine etc. Perhaps there is a delay not mentioned in the FAQs?
The reporting of the first impressions can take up to 5-7 days although how many you see depends on how much weight you have. Also keep in mind it takes around 30 days until you get full benefit from your weight. Be patient and it will come.