Yes ! Updating the plugin was the solution.
Thanks!
Hi Henning,
I saw the the possible solutions before, but those did’t work.
I do not have more than 1500 ads (I think)
My Adsense account seems fully verified (other websites with the same account do work well)
I only have one Google account, so I think the connection is OK.
I do not use an ad-blocker.
There are no errors visable.
Do you have any other idea to solve this?
Regards,
Robert