I've tried this on 2 different computers (1 laptop, 1 PC, both are Windows 7), with 2 different webcames.
All webcams are updated drivers.
I went on chatroulette and facebook to try this. I was asked everytime to enable access to the webcams. Nothing. I go to the Settings Manager, give both sites global access to both cameras. STILL NOTHING.
WHAT THE HECK?!?! WHAT IS UP WITH YOUR TERRIBLE SOFTWARE??
It's not my webcames. It's not the drivers. It's not my computers. Common denominator: Flash. WTF??? WHY CAN'T I USE MY OWN WEBCAMS?????