Which OS is this Mac running ?
If running Mountain Lion I take it you have added the AIM name to the Messages > Preferences > Accounts ?
Have you got the Buddy list on view ?
Is it the combined one called "Buddies" or a separate one for AIM ? (You can unlink them in the General section of the Preferences).
Are you using the Video icon top right of the Messages main window or the green iCons in a Buddy List ?
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously