I'm working on a pearl expert titan (V8) When i'm using a cue-list in manual crossfader, i can't use the +1 /-1 buttons and the snap back / snap next buttons. When i press snap next or +1, the current cue stay ON until the end of the cue list. When i press snap back or -1, the cue-list make a succes...

try this:
Edit times / mode 2 (fade to fader)

I'm working on a pearl expert titan (V7.4) When i'm using a cue-list in manual crossfader, i need a visual control on my screen. I put the Hud on my screen and when the cuelist is running, the cuelist in the Hud is freezing (in the digital screen to). Without a visual control, i can't use the +1 /-1...

Yes. There are some factory macros provided to do this - 'Static Playbacks Page -1/+1/0/1/2/3'. You can assign these to handles via show library: [Open Workspace Window]/[Show Library], select Macros filter. Press Copy, Select macro (for example 'Static Playbacks +1') and select destination handle ...