Hey Ed,
I've had a lot of experience with Matrox cards over the years. All kinds, mostly used for video capture. The one thing that I have found is they all want to be the ONLY card in the system. If they have to share, they always want to be the FIRST. So if you are bent on having to video cards in one system, uninstall them both, remove them both from the motherboard, install the Matrox card and get it asll set up, then install the other one, and things should work.
Let me know if this doesn't work, PM me, I'll get more details from you and try to help more.
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