hdmi to dvi compatibility


I have a Lexicon RT 20 w/ hdmi outputs and an Leowe Articos HD55 with a dvi input. No digital signal is transfered between the two devices in 720p mode (or any mode for that matter). 480p component (analog) works fine. Any advice on ways to resolve this apparant hdmi to dvi incompatability? Intuitively, one would think the digital video would be passed w/o issue to the DVI.
ramc
Thank you for your response. I am not familiar with accronym DRM. What does it refer to?
Digital Rights Management. I believe it gets used as an umbrella term for copy protection of digital media.
Slightly diffrent question. My HD TV has one HDMI input. I have been using it from my Denon 2910 DVD. I just upgraded my cable box, so that I now have HDMI output form the box. Does it make more sense to run the HDMI ffrom the cable box? Will I notice a difference? Is anyone still having problems with the HDMI from the cable box (seem to remember this being metioned a few months ago)?

Yom