No AV video (firewire) device in Cubase 9.5


in Cubase 9.5.10 the AV video device (in my case a firewire DV converter) does not show up, although QuickTime 7 is installed and it is recognized as “AV subunit” in windows device manager. So it is really only Cubase that doesn’t recognize it. I didn’t need the video out for half a year, meanwhile switched from Win 7 / Cubase 8.5 to Windows 10 / Cubase 9.5…and et voila: of course things are not working anymore.

As i understand, there has been a change with the video engine in Cubase and Nuendo, and that QT is not even needed anymore. In the previous version and OS all worked flawlessly. Does anyone have an idea where the problem lies ? Or is anyone successfully using a DV device under Cubase 9.5 ?

My system:

Windows 10 x64 Enterprise LTSB
Intel i7 7700K
Gigabyte GA-Z170X
UA Apollo Thunderbolt