Fredo! Thanks a lot for that! 
The re-install sadly DIDN’T work, problem persisted, but I decided to try transplanting the DLL from my other machine into that folder and hey presto! I now have DNXHD functionality again.
But actually it’s pretty annoying because I hate pulling off dodgy cr@p like that. I wish someone official would just finally answer and give me a damn link or tell me whatever else the hell my problem is.
I noticed that the VSTconnect DLLs are also missing from my new system, but I don’t need that anyhow. Still sucks.