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There's a work-around you can try. Open the macOS 'Image Capture' utility. Connect the camera and power it on. Wait for the camera to show up in the macOS 'Image Capture' utility. Now launch the Camera Window application and see if it works now.
Apple made some significant changes to how USB devices are connected in Sierra (and irritated a lot of people by doing so). I'm 'guessing' it probably had something to do with USB-C support being added -- but I don't actually know if that's why they did it. Mysql Download Mac 10.9. Google Video Player Mac Download.
I do know that a handful of apps that rely on USB devices are now broken as a result. There's another application that I use which is also broken. But the 'Image Capture' work-around causes it to work. Somehow, once Image Capture identifies the device as a camera, then other applications can use it.