Q: Logitech C920 - no video (10.9.5, MBP 13-inch, Mid 2012)

Hello,

I'm having issues with my new Logitech HD Pro C920 Webcam (model number V-U0028).  When I plug it in, it's recognized as a webcam: system info shows:

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HD Pro Webcam C920:

  Product ID: 0x082d

  Vendor ID: 0x046d  (Logitech Inc.)

  Version: 0.11

  Serial Number: 7A***A5F

  Speed: Up to 480 Mb/sec

  Location ID: 0x1a120000 / 4

  Current Available (mA): 500

  Current Required (mA): 500

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It is also seen in Photo Booth and Skype as a valid, selectable camera - but in Skype it's black, and in PB it either spins, or shows what was last on the built-in iSight camera.  I've installed the Logitech Camera Settings app, and it seems to see a camera there but without any way to see the video I can't be sure it's working properly.

A few other clues.  Quicktime Player sees this as a camera but when I try to do a New Movie Recording, I get an error dialog "The operation could not be completed."  This error message corresponds exactly with this error in system.log (via Console):

Dec 13 19:42:24 Phils-MacBook-Pro kernel[0]: USBF:    6992.491    AppleUSBEHCI::Found a transaction which hasn't moved in 5000 milliseconds on bus 0x1a, timing out! (Addr: 4, EP: 0)

I get the same system.log error when I plug in the camera with FaceTime running.

Finally, neither iMovie nor a trial installation of Final Cut Pro see the camera at all (File => Import Media, in the Cameras list on the left).

I doubt this is a "missing driver" issue (as it's meant to be a UVC-compliant webcam which would be natively supported by OSX), but I'm a bit flummoxed as to the problem.  Logitech support is sorely wanting - they know Windows but they and the broader community seem to be at an absolute loss.  "Re-install your computer" was the answer I got.

Any ideas on what I can try, or what further information I could provide to assist in this problem?

Thanks!

:-Phil

<Edited By Host>