Hello Slipstick,
My guess would be that you have the phases of the motors crossed over.
Have you made sure that the output wire pairs are going to motor phase pairs?
The PCB sockets have 4 wires, 2 pairs side by side. They must go to the motor phase pairs (check with a multimeter to see which wires are roughly 2 to 5 Ohms) and connect them accordingly.
When they are okay the motor will run if the drive current is adequate.
To reverse the direction just switch only one pair of wires around.
I hope this helps,
Scintilla.