I went to look at proposals on area51 today, and I keep getting a popup that says that I have been logged in and am being redirected to the main page. It redirects me, but it doesn't actually log me in. I am using my Google account to sign in, and trying to do this in Chrome.
Part of deploying our new centralized login scheme revealed some bugs when we got to Area 51. Looks like you were affected.
It should be fixed now.