Are you sure?
When opening the app/launcher I choose my account, but the itch web site is displayed as nobody is logged on. Also based on the token error it seems as if there is no login token. Maybe login happens, but something goes wrong with the tokens, but only in the app/launcher not if you use the website in a normal browser. So there comes my conclusion from, it's based on a limit amount of info so, it could be something else on the server. But at least it seems only to go wrong with the app/launcher.