Okay, I deleted my AIM account from Proteus, added it back in, and now it's working again. Woohoo!
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"No left turn unstoned."
(PowerBook 15" 1.5 GHz/80/1.5 GB, eMac 1 GHz/80/768 MB, SuperDrive, 250 GB FireWire HD, Lexmark Z65 printer, Epson Perfection 1200U scanner)