fred_fernando:
So there is no purpose in switching them around, since it is the same.[...]
but again, the signal must be alright, since the x2 driver receives the same signal from the same source and works.
I think I was about to respond to this a while back when my internet connection or the Forum server failed.
Clearly something is NOT the same as one motor driver works properly and the other does not. Better evidence would be hard to find.
So try switching things around.
...R