Zero impressions, more than zero clicks - how/why does this happen?

Android Income Reports
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Is it AdMob or did I mess something up in my app?

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Hi,
The fill rate for Admob interstitial is considered quite low.
You can try out monetizing with other ad network like StartApp, Mobilecore or AppNext.
With StartApp, you can earn another $15 when your impressions hit 100k.
Refer to the following link for more details.
Thanks.

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I think there is a bug on AdMobs side the past few days. I have also been experiencing stange behaviour with interstitial impession stats. See http://forums.makingmoneywithandroid.com/advertising-networks/15975-massive-fall-admob-impressions.html