One son is using the my old HD4890 and one son the HD7970, both playing warfront simulation games always from Steam sale and they are not the most modern games, I bet all DirectX9 maybe even DX8 and I never hear they have problems in playing any of these games after an Vcard update by MS Windows, which is generated automatic because of safety.
Most problems are what I think caused by wrong installation, not doing a clean install, or even the wrong driver is selected.
edit: Yep one problem because windows was installing the iGPU driver and not the external.
Let them try WOFF UE and then report. I am talking only about combo WOFF UE + Radeon HD cards + new graphics drivers.
Pretty sure that BirdDogICT identified, quite some time ago, that he was using the drivers you indicate and wasn't having this problem:
http://SimHQ.com/forum/ubbthreads.p...und-after-starting-a-mission#Post4394806In fact, he reported using two different drivers, both from late 2017, without problems. He reported meeting all the conditions you list, and says his runs fine. And I think there are others, too - I haven't looked. But even if not, the one instance is all that's required to disprove the theory. Unless I'm missing something (always possible).