Speed controllers won't communicate w/robot controller

[steven114]

I'm pretty sure I saw someone with the same problem a while back on the forums, but after a good half-hour of searching I couldn't find it - so please excuse me if this has already been solved. I hooked up our robot controller to the speed controllers with the kit-provided data cables, and they blink yellow exactly as if they were not plugged in. I can take the same cable and move it to last year's robot controller, and immediately the light goes solid as it should. Why would the new robot controller not provide the poor Victors with the proper signal? Battery and backup battery, of course, plugged in (although I believe the backup battery is not necessary) and to the best of my knowledge everything is plugged in just fine. I even tried reversing the connectors, with no effect. I certainly hope this isn't a hardware problem...