Hello everyone, I was wondering if someone might be able to offer some advice on the problem I am having. I am using a Blackmagic Decklink Duo card to output to multiple displays for live events and everything is great. I capture external sources like Sony X3 via HDSDI and can connect a single DVI source through the Blackmagic DVI extender. I want to use the Extron MGP 464 DI switcher to add more sources through the DVI extender, as the Extron has a DVI output. The Extron is a great switcher/scaler and works great on its own, but I have been unable to make it work through the DVI extender. If I connect any other source to the DVI converter, it will work perfectly, as long as I feed it one of the resolutions and refresh rates the Decklink Duo supports (720p 50/60 1080p 24/25/50/60 or just PAL or NTSC). I have tried laptops, PS3, DVD players etc, all are fine. Extron also outputs almost any resolutions you can imagine through its DVI main output and works perfectly with plasmas, monitors, projectors etc... Why can I not get them to talk to eachother? I have tried all resolutions and refresh rates, many different DVI cables and still no luck. I would be very, very grateful if anyone has any further ideas as to what else I could try. Here are the links for the equipment mentioned; Extron MGP 464 DI: http://www.extron.com/product/product.aspx?id=mgp464&s=5 Blackmagic DVI extender: http://www.blackmagicdesign.com/products/dviextender Thanks in advance everyone!