I'm testing a LED RGB par 56 from Stairville using default fixture profile and ENTTEC DMXUSB PRO. If a change the value of a color slider by dragging the slider nothing happens and if I point-and-click in the final position of the slider the change may happen even after 1 sec or more.
Using QLC+ 4.6.1 this problem is quite solved although it isn't as smooth as when I control the RGB par using ENTTEC test utility (called "PRO Utility v2").
It's the first time I connect QLC+ to a real fixture but I don't think this behaviour to be the expected one.
UPDATE: I'm using win7 under parallels (virtual machine) on a macbook pro. When sliding (upward or downward) using v4.6.1 the par steps through about 15 different intensity levels which is not enough smooth at all.
Delay and jerks when changing color fader value (4.7.0)
If understand you correctly I had the same issue as you. Under the inputs/outputs tab make sure the input box is unchecked, that seemed to fix it for me.