External camera not recognized by Capture in Video library

Is there any reason why the Processing Video library won't recognize certain external cameras?

I'm trying to get Processing to read frames from a Optitrack V120:Slim.

I have the Optitrack working in an other program (TSPS) and I have a 2nd webcam working in both Processing and TSPS. I'm using the basic "Get Started" example in Processing and have gotten it to work a bunch of times.

I'm not sure where to go from here to diagnose the issue. It feels like there's something inside the Video library that I can't see / don't understand. Has anyone else had an issue with Processing not recognizing a particular camera?

I'm on Windows 7 64bit. Processing 3.

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