Those reviews were posted back when M11 is still new.
The developer is really fast in fixing every bug that any user reported.

I purchased it from Play Store & I didn't have any of those problems.
This morning I receive another update for Papago M11 through Play Store.

Unlike M9, M11 can be used on any number of devices as long all your devices synced with the same Gmail account.

PS: I'm only talking about genuine papago, not cracked / hacked.