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IPC1100 Problems with HDMI-DVI Connection

I installed Quantum TV today and everything worked fine except for my older TV in the basement.  I use an HDMI to DVI cable to the TV.  The IPC1100 will only allow the 480p setting even though the TV is 720p.  The previous CISCO box allowed me to set the resolution to 720p using the same set-up.  Anyone else having this problem?  Any ideas?  Thanks.