Nothing at all happened when I tried to save to file. Trying a normal save froze the game for a few seconds and the little text box (for labelling saves) dissappeared. Otherwise, the game just stayed on the save screen as though nothing had happened.
Well kiss my ass. I just loaded up the game again to double check myself before I hit the post button, and the game is saving normally. *sigh* Well, if it happens again, I'll be paying more attention and try to file a proper bug report. I had an external hard drive attached for a little while yesterday, but I can't remember if it was hooked up when I loaded the game. Thanks for the help, and sorry for the forum clutter.