Hi,
Just installed Dolphin and Ray and when I went to test a/v chat using a macbook pro and a macbook. The built in iSight Camera did not switch on.
I found that if you go to settings for camera and in the pull down list select 'USB Class Video' the iSight camera turns on and you can a/v chat. Apparently this problem exists on a lot of flash based chat sites. Not just Ray.
Hope this helps anyone with the same problem.