Looks like DL screwed up and uploaded an internal QA test version to the play store today. It won't accept passwords or let you log in. Don't install, hold off until they fix it.
They released a new version overnight, 3.4.1, fixes the problem. If you were stuck in the bad 3.4 there was a workaround posted on TOBB- login as guest, go to settings and change the server.