I think this started after the Win 10 Anniversary update.

I have all the updates and the latest drivers.

This is intermittent, but I'm having the problem more often than not at this point.

When the computer is booted up, the webcam mic does not work.  The sound device window shows that the webcam mic is set to default, and enabled, but it does not react to sound.  If I disable it, then re-enable it, it will work until the next reboot.

Dell Inspiron 660

Logitech 9000 Pro webcam.

Also waiting for a reply from Logitech on this.