I have been able to use the extended screen function successfully until last Sunday Dec 3rd 2017. There was a major Windows 10 update a few days earlier to a Windows 10 creator version, and it only seems to be since then that the problem has occurred.
This is a major issue for our church because we use the extended screen function to display the words of songs, Bible verses, etc, and because of the distances involved, direct hdmi connections do not work. Also, because we have a loop system , it gives a lot of interference to the VGA connection.
Please provide a fix to get this working again as quickly as possible.