I have 3 DVR's and setup remote DVR yesterday. Two of the DVRs became listed as remote DVR activated and seem to be working fine. The third is listed as a DVR under "my setop boxes" but will not configure for remote DVR. I have checked the settings on the box and remote DVR is activated. I have powered the DVR off and on. I have disabled remote DVR and re-enabled it with no success. Any suggestions on how to get it to recognize the third DVR?