QLab 4.0.2 Release Notes
fixed
A case where licenses might not properly unlock features.
fixed
Prevent light instruments from being named “all”; that name is reserved for groups.
fixed
A regression introduced in QLab 3.1.24 which would cause videos to briefly glitch when video cue was stopped.
fixed
Changing a MIDI File output patch will now immediately update MIDI File cues to use the new output device.