Audirvana - volume problem

Having continued problems with the volume slider in audirvana. Although set to DAC only, (I have topping d50), if it is set to anything other than 100%, then no music output from dac.
At the same time, sometimes even with set to 100%, no music. then i have to move the slider down, then back to100%, then I get music.

If it possible to have a future option so that we can remove the volume slider completely, for dacs which have their own volume control?