Flash WebCam examples

Hi,
I've been trying to look at Flash WebCam examples - mainly really simple stuff, but none of them work for me...
I have a MacBook Pro, which has a built in webcam, when I try to load up an example like this:
http://www.newgrounds.com/portal/view/326194
I get asked for permission to use the webcam, which I allow, and then... nothing!
Anyone got any ideas what's going on?
Thanks,
Charlie

The simple solution to this was to change the WebCam settings...
Right Click (or Control Click) the SWF and then go to the WebCam tab, change the video setting for the camera from DV video to one of the other two options - one of them should work for you (I read conflicting advice as to which would work.)