I just got Time Warner digital cable (SA2000 box) and can't get my Panny DVR-531 to record anything. It pulls in the TV guide from EPG but shows a black screen when I try to record something. I have the coax coming from the wall into the STB, STB to DVR, and DVR to TV. I also have an S-video cable from DVR to TV. Is my setup wrong or can you not record digital cable with a DVR box?