Hi, I have a brand new mac pro, and I'm using the most recent version of DVDSP. I get the following error when attempting to burn a Dual Layer DVD when it's in the formating stage: "The recording device reported the illegal request: Unknown device" and it gives me the option to cancel. When I hit cancel I get another error "Formating Failed: THe recording device reported the illegal request: Unknown device error. (0x21, 0x00.)" Does anyone have any ideas as to what might be the cause of this? I have had other problems with the dvd burner, things like "medium write error" so I've tried using different types of DVDs (I have yet to try Verbatin--which apparently are the ones with the most success). Any help would be very much appreciated. Do I need to return my mac pro?