I'm having problems signing in with the latest version of the app on my iPhone.
After agreeing to your T&C,9/10 I am shown the "error code 1012" pop up message.
If I attempt to sign in a few times, it sometimes accepts, other times it does not, and I have to exit the app and go through the process again. It also doesn't keep you signed in either every time, even though the box is checked.
Rather irritating at the moment - trust the big will be fixed soon.