Sounds like a Flash problem. Consider any of the following you have not already tried:
(1) Check that your Mac's > System Preferences... > Flash Player > Camera and Mic settings are not blocking your camera.
(2) Verify that you are using the latest Flash version that is compatible with you system. If you have difficulty checking via your Mac's > System Preferences... > Flash Player > Advanced > Check Now button, use http://www.adobe.com/software/flash/about/
If you need to update, use your Mac's Disk Utility to repair permissions before AND after installing the update.
If you have difficulty updating, follow Adobe's instructions here:
http://kb2.adobe.com/cps/908/cpsid_90893.html
Be sure to uninstall your current Flash player before installing the new one.
(3) Double check all Flash Player System Preferences that can be configured in your Mac's
> System Preferences... after the update is installed.
(4) Individual Flash settings are still configured in the same way as older versions.
For detailed help, see http://tinyurl.com/5kjv3
Message was edited by: EZ Jim
Mac OSX 10.8.2