I just downloaded the Salesforce1 Android app. I signed in just fine to my dev account but about 20 seconds after signing in I got a message saying my admin had revoked my access token and was kicked out to the login screen. This is really weird because I am the admin and I certainly didn't revoke my own access token (or anyone's for that matter), especially not in that narrow window.
I tried logging in again but it just clears my username and password and says "Please enter your User Name" in red as if that was the issue. No matter how many times I try to log in this is the only error message it gives me. I tried clearing cookies and reloading from the menu in the top right but that hasn't done anything.