Problem with HDMI switch and Comcast Box

I have an HDMI switch from Monoprice (model#HDX-201E) with an Oppo DVD player and Comcast HD box (Motorolla DCT 6200) hooked up to it. The cable box is hooked up using a DVI to HDMI cable. The switch is then hooked up to my front projector (pretty basic setup).


I am having problems with the cable box when I switch from input 1 (the input the cable box is hooked up to) to input 2 when I watch a DVD. The cable box is somehow getting a reboot signal from the switch and then goes into some kind of download loop where it tries to reset itself but can never finish. It fixes itself immediately when I put the switch back onto input 1.


I've tried changing the inputs of the box and DVD player but the same thing happens if the cable box in on input 2 and I switch to input 1.


A useless call into Comcast basically left me with a "we only support a cable box to TV hookup. We can't help you with the setup you have using a switch". Apparently, I am the only person in the entire world who uses some type of video switch so Comcast has no idea how to help or if this is a common problem.


Can anyone here tell me if there is a setting I am missing on my cable box or if this problem is common? Or could my switch be bad? To me, it sounds like a signal issue where the switch is somehow interfering with the direct antenna line going into the cable box. If I disconnect the box from the switch (i.e. simply pull out the DVI/HDMI cable) there is no issue with the cable box.


Any ideas?


Thanks!