One of my Patreons is unable to log in with his laptop: whatsmybrowser.org/b/DV27MEN
Before I updated the plugin yesterday, he couldn’t log in with his iPhone either, but now he can. So progress, but is there some reason why Safari 9 shouldn’t work?
Asking him to clear all his cookies on the browser he is unable to login, and then retry, may help.
He has already done this, several times.
Where does the process abort? He comes back from Patreon, or he is hung up on a screen at Patreon?
Ah. This is not a WP plugin issue then. If this is persisting, you should put a ticket at Patreon zendesk.