Michael

Never thought of checking for the existence of Play Services since I'd assumed that, by using the library, it was getting slapped on GPlay-enabled devices (or the Play Store); isSignedIn()...

It'd be nice if it tosses the error in Android Studio, so I'd try building it there after updating to see if it does; if it doesn't, then I'll have...

Dug around and, as with the mv-client, I'm also not making use of any Developer API stuff. None of my test apps up on the Play Store have caused me...