I'd post this question on Meta Stack Overflow, where it belongs, BUT I CAN'T LOG IN!!! If you read this message on Meta Stack Overflow, it is because someone has moved it from Stack Overflow for me...
The cookie on my current box is allowing me access to my Stack Overflow account (and thus I can post this message), but I am no longer able to log into Stack Overflow on a fresh box!!!! When I try, Stack Overflow tells me I'm a brand new account.
I tried logging in using both Google and MyOpenID, thinking perhaps I had simply forgotten which to use. And then the problem gets worse! The Google log in tells me "you are about to make a new account." Ok, so I figure I must have used the wrong Google account, since I have two Google accounts.
So I cancel and try logging in with Google again, but now it permanently assumes to retry the prior Google account that I had requested to be cancelled. The only way I can try a different Google account, is to go to a different machine and try again. Aaargggghh!!!
I could try deleting all temporary files / cookies, but then I will lose my Stack Overflow "already logged in" status from the box I'm using right now.