[Kevin Sevcik]

The schematic shows all the pins as parallel. If there's an electrical problem with the jaguar that's holding one of the data lines high or low, then that should affect all/most of the jaguars on the bus, not just the ones "downstream" from the bad jaguar. Perhaps your have a jag with a bad connector on it? You should be able to make a pigtail cable for each port and check for continuity between each pin. There should be continuity between pins 2-5 from one connector to the other.