I did the procedure of adding an ad to my app exactly it was supposed to. A few days back everything was fine the test Banner ad and test Interstitial ad shows fine but from today IDK why it has become black but it is clickable. I opened my AdMob account and found nothing that may cause such a problem. Is it normal? My app is currently in the testing phase.
Here is a screenshot of the test banner ad from my app. (from a smartphone)
The problem of the same black is for Interstitial ads too.
