There is a bug in OSX Lion where the Flash Player Settings dialog pops up and prompts you to click “Allow” but you are unable to do it.
Here is the fix:
Go to System Preferences on your Mac
Select Flash Player
Go to Camera and Mic Settings By Site…
For the entry for edgecast.cam4s.com please change the setting from Ask to Allow
In this window click the + sign to the bottom left to add a new entry as below