And it seems to work without it. Is MoPubActivity necessary? It has it’s own MoPubView which might have been showing the ads when there was no MoPubView created by me…
The MoPub Activity has a way of creating it’s own adview (I looked into the code) - I removed it from the AndroidManifest for now (everything works without it…) and contacted mopub. Let’s see what they have to say. For now I turned off marketplace, people who paid to not have ads would kill me (well, not literally - just leave bad reviews and not buy any IAP later) if they still had ads.