Help! I Lost the ability to "send" video and text on Yahoo.IM, on a MacBook Pro 2.4 GH Intel Processor OS X

Help! I Lost the ability to "send" video and text on Yahoo.IM, on a MacBook Pro 2.4 GH Intel Processor OS X 10.5. (which I also reloaded) Everything else, Safari, Firefox, iChat, Photo Booth, etc. works fine. Maybe I lost a driver, or preference. Thanks, Dancingman99@yahoo.com Dennis 619-583-2717