does button come back or will it wanish and stay like that? if button appear again after closing then try to use a name less than 10 character or try closing and opening again, if button does not appear again then it means its stuck in logging in
of course i am not sure how good it will work out but i am the one who knows what happens in that code, so thats my guess on how to fix it.
Yes, the button vanishes and comes back. My name is 9 characters, I tried naming myself: "BetaFruit" I will try again as "beta"
i saw beta, you seem to successfully log in and changed your name, it should let you play, if not that is really strange.