stepper motor does not move

The stepper motor pins can be checked without any tools.
Disconnect the motor from the controller.
Jump any two pins together.
Turn the motor shaft by hand.
If you feel a clear resistance, the pins belong to the same coil.
If the shaft rotates freely, the pins belong to other coils.
Shaft vibration instead of rotation is a typical symptom of confused wiring.
However, if the engine stands still and squeaks, it is a matter of settings, either the controller or the program.

Sörry for eventually annoying anyone. Some reading I certainly did, it is just a lot of stuff. I have used several motors both of the same and different types and two different drivers. I can limit current at the tb6600 and certainly did. The cs-d508 does not provide any switch to do so. Its datasheet mentions overvoltage and overcurrent protection. Apparently the current nevertheless is too high, not too low. The motors heat up quickly when not moving. I lost a second one even though I have become more careful after the first one burned. I certainly do know how to wire a 2 phase stepper. Mistakes might happen, but I will not repeat them every time I reconnect the stuff. I have been working with steppers and arduino but not yet on a professional basis.

So at the moment, I suggest its more likely a latency issue. It is gonna take me a while to go through the stuff pcw has told me. After that, I will let you know what I did and what were the results.

Cheers

The stepper motor withstands temperatures of 120 degrees Celsius.
This is, of course, the maximum parameter and during normal operation it should be cooler.
On the other hand, if the motor is cold, it means that the current is too low, resulting in less shaft torque.
Without a thermometer, this can be assessed by stating that the engine should be hot, but should be able to be touched by hand.

You have:

FF1 = 0

in your ini file

This should always be 1