[Cecil]

The first thing I would check is that your cables are made right. Do you make your own, or did you buy them pre-made? If they are pre-made and from somewhere like AndyMark, you should be fine. If you make them yourselves, make sure that they are correct (only the middle 4 pins of the 6 place connectors should be used and wire 1 should go to pin 1 on both connectors).

Also, check inside the CAN ports of the Jaguars themselves. There have been problems with the internal pins going down but not having enough spring to make contact with the connectors. With the power off, inspect the internal pins and see if they are pressed down too far.

Have you flashed the firmware on all of your Jaguars? Try doing it one at a time with BDC-Comm, remembering to have the terminating resistor in place.