I've managed to get around the problem by just playing in DX9 mode, even if I don't want to use it. So I take it I'm not the only one that suffered from a full pc crash? 3 days ago or so on DX11 mode I actually blue screened 3 times over the course of the day (once inside a dungeon, once inside my house when I wasnt even at my computer and came back to my desktop, and once in the field) but after switching to DX9 I haven't had a single crash or error. Whatever havoc it is doing on my pc only seems to matter when FFXIV is open on Dx11.
I'm using a GTX 1060 but the latest drivers didn't make a single bit of difference. It seems like DX9 mode or bust for now for the lot of us. They have at least moved the thread that was in the bug section to "accepted bugs" but I have not heard of Square Enix doing or saying anything else on the matter yet.