When trying to start the engines (using the instructions in QID 203) the switches do no hold their position, I've tried holding the mouse button on the switch, not holding it but keeping the mouse pointer on the switch (so the guard remains raised), etc.  Whatever I do the switch does not remain in position.

I can start the engine but only by repeatedly clicking the switch back & forth.

So, how can I click & hold the switch in the start position??

PS, I get the same problem with the 727

And once your in faliures check that everything has no tick. And it should work.