I apologize for the inconvenience. We ran into a severe outage about an hour ago and our Ops team is working on it. One of the symptoms is issues logging in. I think this is what you're experiencing. Under normal conditions a member should not have any issues logging in/out/back in.
I apologize for the confusing experience and am hoping it's resolved soon. If you're still not able to log in, after the outage is fixed, then we'll have to take a closer look. I'll post here once I have news related to the outage.