We are facing some strange behaviour with the new FP 10,1,53,64. Some Windows user seem to have a Plugin crash as soon as you publish the stream. The funny thing is that I have the same Windows7, FP 10,1,53,64 on another device, working fine :) ). While some people tried 2-3 boxes and all crashed :( (.

The behavior can be quite easily duplicated: You can just goto the Youtube Self Recording application (http://www.youtube.com/my_webcam) as soon as you hit on the button in the Security Dialog, Flash Player crashes.
Here are some sample screen

Screen 1 Openmeetings

Crash:

Screen 2 Browser Crash Flash Player

There is no difference in IE or Firefox. The webcam the user was using was a cyberlink webcam. Other Laptop’s with integrated webcam did crash too.

There seems to be already some buzz about that at:

http://flashvisions.com/general/flash-player-10-1-1015364-crashes-when-accessing-webcam/

http://forums.adobe.com/message/3031253#3031253
And somebody proposes a workaround:

http://sixby9.co.uk/general-computing/solution-webcam-crashes-or-hangs-flash-and-browser/

Hope guys @ Adobe will come up soon with an update, before my clients bang my head against the wall :) )