Hi All
FYI. I had the same problem posted by rssics above. Win 10 64bit, latest (384.76) NVIDIA driver on an old GTX690, except I am running sh3 in win7 compatibility mode. Exactly the same symptoms.
Following the link kindly provided by Theberbster, a couple of posts above, to the post by james_nix, I set my main cfg to Synchronized=Yes.
Now running in 1920 1080. Yay!
My thanks to all the above mentioned. o7
This mod is ESSENTIAL to me.