Hi,
I seem to be confusing two settings.
This one is the one I was thinking of
The One I actually should have said
Of course some of these setting have moved before between different Versions of iChat.
In th Accounts pane check the Security tab and/or Server Setting as it might have got moved to either of those.
It may have been grouped with the Status Message setting in the General Section.
Other place might be iChat Menu > Accounts
This just used to List the Accounts and toggle them On or Off individually.
Logged in Accounts are also listed in the Window Menu so it might be worth checking there as well.
There is a vague chance it has been moved to the View Menu.
If it is not there at all, ask for it here http://www.apple.com/feedback/ichat.html
7:47 PM Sunday; July 24, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb( 10.6.8)
Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously