I bumped into a couple of threads on the web where AdSense members have been complaining about missing impressions for some sites in their AdSense accounts. These sites show zero impressions in the AdSense reports. This has been occurring since the middle of January.

I checked my AdSense account and I do indeed have a few sites that are getting traffic, yet the accounts no longer appear in the AdSense reporting.

The ads do appear correctly on the sites, the domains are registered in AdSense, the publisher ID is correct and the sites do not violate the TOS in any way.

Is anyone else seeing this issue?

Has anyone identified a cause?

What is a good alternative to using AdSense?