This started 2-3 days back (probably 4-Feb-2019). I was working on an app which easily showed banner and interstitial ads in companion as well as exported apk, suddenly stopped showing any ads. Earlier they were getting displayed but not now (I tried with Banner and Interstitial).
I have recreated the issue in a simple app.
#The app has only 1 screen with an Admob Banner Ad, a button and a label.
Here, even test ads are not getting loaded on screen initialize in companion and apk.
On button click, the test gets loaded in companion, while the apk install makes the label as Not Loading.
There is one more issue with buttons which started with this problem. Let me know if I could explain the same here or start a new topic.
Note: All previously exported (before 4-Feb-2019) apps are working fine (No button or Admob issue).