Fading Problem

my Problem is, that if i enable Fading in a cuelist for example and start it it isn´t smooth, it jumps.
we are using a m-touch, but i also tried a enttec open dmx interface. I tried to mess with the dmx Timing, but it didn´t work. I finally tried an other Program. It wasn´t Jumping, it was Smooth.

I really like Onyx, but we use it for a big Theater, where the Fading has to be smooth. I hope, that somebody can help me.

Sorry for my bad english,