There is no normal with AdSense anymore - that's been pretty much established. I have pages with unique ad units that during the day shows pageviews when I check reports. However when I check stats the next day the reports say there were 0 pageviews for that ad unit. AdSense reporting is shaky at best these days - been this way for a while. It's hard to use the data to make decisions anymore. But to answer your original question, it sounds like you are encountering the same reporting error (lack of impressions) that I am seeing.

Turn on "Automatically allow new Google certified ad networks". I know that it doesn't looks like it should be turned on, but in my case that was the solution.

Turn on "Automatically allow new Google certified ad networks". I know that it doesn't looks like it should be turned on, but in my case that was the solution.

I did about a week ago, and still 0. It shows 1342 allowed networks and 0 blocked and Automatically allow new Google certified ad networks is checked? Again for about 7 days now.

Maybe they don't have any inventory for you. Or maybe the reporting is off.

I just checked mine and starting from the 18th the only network that served ads was AdWords.

I just checked mine and starting from the 18th the only network that served ads was AdWords.

And you didn't turn them off? Interesting. Anyone else?

No, I haven't touched anything. Ever. All the options are checked.

Today they are showing in droves. It took 7 days...

OK, starting from the 24th they came back. Something's going on at the back end. They are cooking something. So far it doesn't smell good.