Maps not loading when app compiled on Windows

I have a problem with a simple map viewer app. For some reason my app works fine when I upload it to an Android device via an iMac, but when I upload the exact same app from my Windows computer it loads the MapActivity, but no map tiles. So I do see the raster, and can move it around. Just no tiles.

I have the feeling it's something stupid I overlooked, but those things are often the most annoying to find.

I also checked the Google Maps API key, but came to the conclusion that debugging keys are the same on different computers, so that didn't matter.

开发者_Python百科Any ideas?

Ok, I did the sign up process another time and got another key this time. Now it works. I don't know what went wrong before.