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Also I have attempted all sorts of uninstalling, restarts, and reinstall. Still says I do not own it! 
I got the pro app from Amazon and have the same problem, it says that I do not own the app and only lets me quit or resist the store (and then quit). Even the free version says the same. I tried to get Amazon to help (phone and email support) but they said that the problem is with the app, not them, and they couldn't help further. The Free app from google play store works, but I would like to use the one I paid for from Amazon!