Processing cannot access cameras (while other apps can)

Hello, I suddenly cannot access either my inbuilt of external-firewire cameras due to what seems a java/quicktime issue: i get the following error in the console when attempting to read a camera at sketch startup:

2016-09-09 13:20:26.575 java[3312:215235] *** QTCaptureDeviceInput warning: The device "WebPluginVirtualCamera" was closed while still being used in a capture session. Make sure that the session is not running before closing any devices it is using. To remove a device from a session while the session is still running, remove the device input before closing the device.

My System: macbook pro 2.6GHZ 16GB RAM running El Capitan 10.11.6

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