Ok, 5.1 is not needed for game.
Works fine with 5.0 and 5.2 on top.
But my weird graphical glitch is still there, and every time now...
To avoid it, I have to transit by control room each time i want to go to deck view
Tried plenty different settings, even everything on low, even without WAC crew folder...no joy.
Driving me mad, i deleted everything, and will be back on GWX.