I just moved two URC MX-2's (along with the rest of the AV Stack) to a dedicated closet and I can't get the devices hooked up to the serial ports to function (3 Sony TV's). All hooked up the same way, it's just a longer run, nothing really bad, maybe 20'. Cables are good, tried some A/B testing hooking the same cables up to some IR emitters and it's all functional. Just using standard 3.5mm stereo cables. Any suggestions?