However, if I were to guess, I'd say that the most probable cause(s) would be:
* Maximum CPC was changed to a figure higher than or equal to daily budget
* Ad(s) may have been disapproved
* Ad(s) may have been inadvertently deleted
* Account may have hit more than 100,000 impressions, and ads are being reviewed - as mentioned in eWhisper's list.
AWA
same problem here... I am sure, that I configured everything fine... campaign active, keywords normal, daily budget fine, etc.
I even added a totally strange keyword and still got NO impression.
My personal guess is, they are reviewing without telling me... the internal status seems to be "ON HOLD"...
any news from you?
P!