Platform B,C,D etc (func_door) should have the flag ticket as "Starts open"?
Also, I tried with the multi-manager and I don't really have a clue how to put up the trigger setup. At this moment only platform A behaves as it should be. I got platform A to trigger the multimanager wich triggers platform B but it reacts all funky.
If you could write a step by step explanation that would be awesome.
Cheers in advance.