just today, my mail app starting acting weird. it'll check the POP servers, if there's an email, my alert sound goes off, but nothing new is showing in the viewer. i then check the accounts via webmail, and sure enough, there's a new message that was opened, but never showed up in mail.app. the only thing i've tried doing is restarting, which didn't really do anything. i'm using mail 2.0.5 on 10.4.4. any suggestions?