CauseA USB camera does not work properly in the guest operating system if the macam USB web camera application is running in the Mac OS X 10.6 host operating system.
ResolutionTo solve this problem:
1. Shut down the virtual machine and close the Parallels Desktop application.
2. Reboot your Mac.
NOTE: Please print these instructions from File ► Print browser menu for your convenience
After the reboot, do not start the macam application.
3. Start Parallels Desktop and the virtual machine.
4. Connect the camera to the virtual machine by clicking the USB controller icon in the virtual machine status bar, and selecting the camera name in the list.