We noticed the same issue on JabberCam.com with a Sony Vaio PC (Win 7) and a Mac (Snow) but works fine with a different Sony PC and two other MacBooks. Please get back if you can reproduce or debug this camera-related issue, do not focus on iSight camera since the same problem was found on a PC, it is FP related.
I can reproduce it on my Macbook(OSX 10.6.3) very easily, debugging is another question. What does FP stand for, Flash Plugin? What's the best way to debug flex apps like this? Is there a way to put the app in debug mode and have it do verbose logging?
I'm seeing the same behavior on http://testmycam.com, so it's clearly not an issue that is unique to RVC. But it would be nice to offer users a workaround.