I have found a problem if a playlist is playing and the Level in the cue panel is changed manually (the yellow downward pointing indicator is moved and the "Level" legend changes to "Level (Manual)").
If then a fade out of playlist cue is exectuted there is a delay similar to the requested fade out time then an audible glitch and then a short delay and the level jumps to zero.
This also happens if the ">" sign is used to force a playlist item to fade out and go to the next one in the playlist after a manual level change.
Neil