What version of software is in each car? Are you checking the inputs thru the variables (assumed)? When the car is on insp, can you manually (with the bull wheel) open the doors? clc adj 18? Have you tried switching the master and slave car? (for the other problem) Do both cars show Mas on the status display? When you press the open button and the doors open 1" and immediately close, do they try to reopen agaain or do you have to let off the button and hit it again? While it is open 1", does the dol input go low? Is the dcl high at this point? Is the dcb input high?