Is this a new install?
If not, did it work fine before? Have you tried connecting the hdmi from the cable box to another hdmi input on the SP3?
If sound comes out correctly, the issue would be with the satellite input of the SP3.
Does the satellite box have other digital outputs that you can try out?
If have experienced issues of my own with cable running through the SP3. The issue in my case was that projector would turn itself off randomly when watching cable. After some troubleshooting I have zeroed in on the satellite box. It appears to be that the cable box is sending some odd signal that makes the projector turn itself off. Right now, I am running the cable hdmi through my Oppo 205 hdmi in connection. I can see that the screen going dark every so often but the projector stays on. I think that in my case my cable box is defective and the Oppo is fixing whatever odd signal is coming from the cable box. You could use your Oppo for troubleshooting your issue.
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