Had the same problem displaying video on a PC that had 2 or more monitors attached. If I were to disable one of the monitors, the video would instantly come up. If it has a problem on a pc with dual monitors, then this leads me to believe it will probably have problems with various video cards out there.I strongly advise you to get rid of this hunk of junk. I had NOTHING but problems with it…

Source: No video in IE activex with DVR – CCTV Forum