Okay, so I screwed up. Getting tired of me saying that yet? Me too... (*sighs*)
I was fiddling with the cookie settings in an effort to fix a problem where people were being logged out of the gallery every time they switched to my phpBB2 forums, and now it won't let me log in at all.
It's recognising my username and password, it shows me "login successful" and all that jazz, but then the index loads up and I'm not logged in at all... as the only admin at this point, this is tres perplexing.
I've reuploaded all the .php in the main folder to see if that would fix the problem, but no gratis.