I just got a new Windows 10 high end desktop, re-installed SH5 and ran into exactly what you described. Applied the fixes you suggested and I'm up and running...nothing but Outstanding!
Now on to getting my game the way I want it with many of the great mods on this Site. Just a Happy Caption on my soon to be reborn sub...
Thanks again for posting this rather simple fix, just a bit embarrassed I didn't find this on my own...
