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I have Brighthouse cable with an Scientific Atlanta Explorer 4250HDC. When the Slingbox is NOT used, all channels work fine. Once the Slingbox is connected, some channels bring up a black screen. You can hit the guide button and that comes up, but no audio or video. The same comes up on both the tv itself and if you loginto the Slingbox. I called customer support and was told that there is an issue with the cable box where there is some sort of DRM preventing the transfer of the signals. I tried all compenent and then all composite cables. Neither made any difference. Anyone else have this problem? Any ideas on how to solve? I am going to request a new HD box this week. Thanks!!