An annoying bug has surfaced in Flash Player 11.2 that breaks support for some webcams. It appears that cameras of the Microsoft Lifecam VX series are most affected.
A few days ago a customer contacted me about an issue he was experiencing on Scribblar whereby his webcam image would freeze immediately after starting the camera. He also noticed that this problem only occurred in the latest Flash Player versions 18.104.22.168 and 22.214.171.124.
The only known workaround currently is to use an older version of the Flash Player - the following forum post has some details: http://forums.adobe.com/message/4320673#4320673
I've heard reports that there may already be a fix in Player 11.3 beta - we will know more when the final release drops.