Facebook authentication failed for me (and it opened a wormhole)

So, I tried to reauthenticate with Facebook and it failed.
Steps:
I started the authentication process from my settings, which opened the shadowbox pop-up in the socialthing interface, as usual.
Took me to the Facebook auth screen where I entered my email add and password (I know they were the correct username and password, as Firefox saves and auto-fills my email address and password for Facebook).
Then, the bork... so, while still inside the shadowbox pop-up:
after the facebook auth screen, I got taken back to the socialthing home page, where I logged in again. Upon pressing "Login" after entering my email and password, I got asked if I wanted to download a file named "auth" (why not? I thought), and I clicked Ok to save it to my desktop. It was a text file that contained: {"text":"Login Failed."}. So I was doubly logged in to socialthing inside of socialthing.
Upon closing the shadowbox pop up, I can access my socialthing account with no remaining problems, although facebook is still not authenticated.

And wtf get satisfaction, why can't I post screen shots??