DMK51 not playing with PHD2???

[Merlin66]

 We're having some issues getting a DMK51 to play nicely with PHD2

On the observatory  Win7 32 PC I have the DMK51 installed with the IC driver: 2.9.4.1923, connected to USB2 port.
It works and gives images with both FireCapture and Astroart without any special settings.
With PHD and WDM webcam settings it works under UVC Video. In the camera/spanner icon the UVC video controls come up.
All the options are unselected BUT the default exposure seems to be -4.

The exact same camera, with the same IC driver and PHD2 connected to a USB2 port doesn't seem to run on a Win10 64 PC!!!!!

The camera appears to be recognised, but the UVC "control" screen doesn't come up after selecting the WDM webcam option.

Has anyone experienced similar issues/ problems? Is it a Win10 thing??