Matrox TH2Go digital version

I have been using Matrox TH2G for a long time now, both in the analog and now in digital version.
I have always had a 4th screen coming off the second outlet of the video card.
Until recently I have never had any problem with this arrangement in FSX.
I have always had a 4th screen coming off the second outlet of the video card.
Until recently I have never had any problem with this arrangement in FSX.