I will update this post as I go.
THERE IS NO SOLUTION YET BUT UNINSTALLING THE WINDOWS UPDATE
DISCLAIMER: I am NOT working for MARTIN, Harman or Samsung. Asking me about anything these companies do or don't is useless.
System: Lenovo Yoga i7, 8 GB RAM Windows 10
Artnet: MA NPU II
Martin USB-DMX Duo (grey)
Martin M-PC Beta 945
Prepatch: DMX Duo and Artnet working as intended.
Installed the Windows Patch. Artnet and USB-DMX-Duo stopped working at all.
The USB-DMX Duo is still recognized in MPC and the LEDs are still working, yet no output.
Test 1: The Workaround mentioned by Sylvain a few posts above, and found under https://www.theastrogeek.com/dark_sky_journal/microsoft-windows-10-security-update-causes-ascom-drivers-to-crash/1/2018
Found the following entries in DCOMCNFG:
put them all to "call" - still no DMX Output.
Reverted back to before the patch since I do need it working now. More testing once I got more info.
Additional information: Microsoft admitted breaking several things with the patch and promised an solution.