I am seeing a similar but slightly different problem in the SliderSetValues().
I would expect, when trying to 'reset' a slider with one indicator to 0,0, to use:
but this does not work! The slider does not move in any way.
Rather I need to get the values from SliderGetValues(), and reverse them (make them negative) to move the slider.
What is worse, of the four values returned by SliderGetValues(), it is not the first and second that I need, but rather the third and forth, e.g.:
That really doesn't make sense to me.