iChat Video Conferencing not working in Leopard

I upgraded to Leopard and video conferencing isn't working on ichat.

I have a MBP, C2D, 2.33 GHz, 2 GB RAM, 256 MB ATI RADEON.

When I go into the ichat Preferences pane and click on Video/Audio, there is a message ' This computer does not support videoconferencing.'

What the ??? isight integrated into the MBP, and not video capable ??

How can I solve this, it's really annoying.

Had same problem, google did find a sulution (I'm just posting it here if anyone else gets into same trouble):

"What DID work was opening my Finder going to username(your username)/Library/Preferences/com.apple.iChat.plst, and hitting DELETE. I then restarted iChat and was able to initiate video conferencing."