Hi,
As posted below you may lose camera icons if you have another app that uses the Camera open before iChat.
You could try going to iChat menu > Preferences > Video Section and changing the Bandwidth Limit.
Change it to 500kbps.
Changing this setting will write that in to the com.apple.ichat.plist, which may be enough.
If not delete com.apple.ichat.plist and restart iChat.
The File is found in Your Home Folder/Library/Preferences (Hard Drive/Users/(your account)/Library/Preferences)
7:43 PM Monday; November 8, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"