Okay, frickin' problem solved. The original switch burned out on the up window switch and then the new switch, when installed, just managed to bend the exact connector tang that did the same thing! The problem mimicked itself so as to throw us all off. Upon pulling the switch out, I saw the bent tang and fixed it- Voila!

Window is now working fine and I'm a hero (to my girlfriend, that is). Man, ya gotta be Sherlock Holmes sometimes...

Thanks for the help, guys! So far....