@GooglePlayMusic Getting the 10 devices authorized error when trying to upload new music, don't have near that in my list, still removed one; just won't auth my desktop or any new devices at this point; had to remove on my phone cause' PC wasn't auth'd. Didn't help.
Sorry to hear about this – if you haven't already, try refreshing the app by going to Menu > Settings > Refresh. You'll also find more info on how to remove devices registered to your account here: https://yt.be/help/4Khh . Let us know if that helps.