Hiya,
We use an Apple Mac Powerbook together with an Apple iSight.
In chat room click the camera icon to show and it should just show. If not, then click the camera icon WHILE HOLIDNG DOWN Ctrl key and select settings. In settings use the drop down box to identify the camera. Once done come out of settings and reclick the camera icon to transmit your pictures.
Audio does tend to be problematical in the room for some obscure reason but video does work.
Any more problems let us know and will attempt to help you figure it out.