Using Windows 7, Firefox 27.0.1, on a computer that I've definitely been able to log onto Meta's before.
I'm a moderator over on Arqade, but I'm not logged in on Arqade's Meta site, and can't appear to do so, either.
Wait, scratch that, I'm logged in... and, scratch that again, when I opened the question I've been trying to close as a duplicate, I'm logged out again.
Clicking "Log In" takes me to the parent site's log-in page (where I am already logged in). Clicking through the Log In routine (using Google) successfully takes me back to the Arqade Meta page I was at... but fails to actually log me in.
Clicking "Sign Up with Google" takes me to a 404.
I am stumped. (And even more confused because it's only happening on my home PC, but not my work or personal laptops) Any help?
And yeah, no problems logging into Meta.Stackoverflow, either...