the rear opening is it the only opening at that landing? or is there a front and rear at that landing? i hand issues very close to this with some DMC elevators. you will have an expansion board on the clc for the rear opening, they go bad and do very odd things,replace it. also make sure the car with the front and rear openings is the master. let me know if any of this works i will look in my adjusters book to see if there is some other odd input that might need to be set.
