Cascade Classifier Tutorial: Int. webcam not opening on Windows 10

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Good afternoon:

First, thank you to whoever did the Cascade Classifier tutorial. We very much appreciate your work and contribution.

We are building and running your tutorial AS IS with no modifications. (Kudos!)

Here on Windows 10 (64 bit), the tutorial pops up a console and the OpenCV UI (?). The OpenCV UI window is flat gray with a heavy cross-hairs cursor. Nothing appears there -- even after, say, 10 minutes of waiting.

My webcam is working: I can use it with the Windows 10 camera app. And while it's in use the Cascade Classifier Tutorial provokes a different window to select a webcam. But when I run it by itself, it doesn't display anything -- it's just gray.

Any help, suggestions, or even questions would be greatly appreciated.

Thanks,

- Dave Ferreira