I had this same problem, and after the latest drivers fron Nvidia, it went away. I also noticed that when I would quite the process "DWM.exe" it would return my system to normal (Regual background - and my pinned apps would show up.)
I have this same problem. When I look in audio devices I can see the "Integrated Webcam" but when I click on " set up microphone" it says that the device is not setup.
I have this same issue. I have found that stopping the DWM resource (Select "Show for all users" first) will bring it all back. However I have to do this every time I restart.
I was messing around with themes and changed a few settings (found a great background) and now after I restart, I have a black background and no icons on my start bar. If I restart the DWM service, then all is well. However, next time I reboot I have to do that again. Any thoughts?