UPDATE 22/02/2012: It looks like it happened again. Although I no longer user Admob, I've noticed increase in traffic from Google about fill rate drop on Admob. It is either a technical problem or they again started mass massacre of accounts!
Well, again problems with Admob!
5 days ago i've noticed that one of the sites I have registered with admob started to get only 5% fill rate.
This is obviously a penalty. Problem is that I didn't get any notification (as always) about it. There is no aperant reason for it too. My traffic or CTR didn't increase, infact they dropped in last few weeks.
I don't know if this is automated penalty or someone from admob marked my site.
I have also sent an email to firstname.lastname@example.org to ask about it. Guess what? I didn't get any reply. I don't think I will.
Planing to or using admob? See this post about closure and re-open of my admob account