Thanks for the reply, and thanks for digging into it. Do you have any Idea why the shadows quickly disappear on my system? It seems to be a common problem, at least I read about it a couple of times.
After digging into that, I found that cinematics toggle off shadows for some reason. It also toggles it back on after the cinematics are finished but that doesn't seem to be working as intended. Odd how I never noticed this!
I'll fix it for the next version, thanks for the report!