I also have the same results.
Buttons and 'copy scenes' sliders have no effect.
Only channel_sliders work.
Also if I go to Functions tab and selecting a scene adjusting the sliders has no effect. The chan value always returns instantly to whatever the VC channel_sliders are set to.
I have raised this issue in other posts.
My conclusion was :
Sliders in Level mode always send/Tx their value constantly. So if a chan is in LTP it will always see the slider value.
When in Playback mode, the value is sent/Tx only when the slider is moved.
I also noted that when a new slider is created, on the same chan, in Level mode, that slider takes control. The first slider now does not work.
This seems, to me, as evidence that sliders in Level mode never stop sending their values. (Even if at 0)
Hope this helps.
Qlc 4.10.1 Mint 17.2 (ubuntu 14.04)
Ps @ Massimo.
My problem with the LTP/HTP buttons (in fixtures) not being refreshed on screen was down to MATE . Kde and Kcfe work fine.