Blank screen for channels above 99

[mjknoops]

Hi, I just received my brand new MVP from the Sage Store, and it works great for channels 1-99. When I try to watch channels above 100, however, I just get a black screen with no sound. Here's my setup:

Hauppauge PVR-500 card with dual coax in (using the cards to tune channels 1-99)
SGR 1.10 using a Motorola DCR-6200 cable box (Comcast) via firewire tuning channels 100-999. My graph takes the input from the cable box and dumps it straight to a file (TS file).
Sage TV 5.0.2 server
Sage TV 5.0.2 client
Sage Media Extender

In the above setup, all the channels work like a champ in Sage TV and the Sage TV client. However, channels controlled by SGR will not work with the media extender. I thought it might be a problem with those files being a TS MPEG vise a PS MPEG, but I can play files recorded using SGR. I just can't play live TV.

Any thoughts?

Mike