I've got the same problem as this gentleman: https://answers.launchpad.net/ubuntu/+source/flashplugin-nonfree/+question/176541
Where the webcam settings / access does not work at all / is completely unresponsive in Ubuntu 11.10.
I've tried webcam access in Facebook, Google+, my own code + a number of tutorials/demos and none work.
What happens is the settings dialogue is completely unresponsive. Clicking tabs or buttons does nothing.
In the question linked to a suggested answer is to run Unity 2D. Unfortunately this does not work for me (the exact same thing happens). I've also tried Gnome 3 which also does not work.
Note that it is only the webcam settings that don't work. YouTube videos and annoying banners work just fine.
Does anyone know of a workaround for this (except going back to 11.04) or if they've fixed this in 12.04? - also, are any of you experiencing the same thing?