Okay I got the game working. No problems and played for three hours last night.
The DirectX error #38813 existed when running the latest Nvidia driver version 388.31.
I DID NOT do a complete uninstallation, but DID clean install driver version 385.69.
As you may know, Nividia drivers do not always overwrite existing ones if the current versions are the same or newer. So what I ended up with was STILL version 388.31. Somehow, however, everything is working.
This Direct X error # 38813 does not appear to be related to the Windows 10 Fall update. I am running version 1607, not anything newer. It evidently is a problem with the Nvidia drivers and this game alone.
Also, I had no problems running the game WITH multiple displays activated.
As previously stated, by clean installing an older driver version over the top of the newer one, it is now working. It seems like everyone is finding a different solution to the same problem, which unfortunately makes it harder to pinpoint a direct cause. I'm posting this info hoping it helps someone else.