I just bought a dp34 and tried connecting it to my dp quad; connected to this is a dvr625. I used the same 2 lines that were going into the 625 and were working perfectly; but with the dp34 I can only get either 110 or 119, not both. I've tried switching the inputs to no avail and even ran a third temporary line to the dp34 and it only reports a duplicate 119. Is it just a bad switch? Thank you for any help.