Users Tip "How do I reinstall iChatAV 3.x 4.x or 5.x ?"
iChat 6 will depend if you created and Install Disk when you downloaded Lion.
If not then we will need you to have created a Backup before doing anything with the iChat App and using Time Machine to get it back.
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously