Hey, no worries.
So, yes. You have to 'globally' set the MOTU's outputs as MIDI Patches in Settings for that QLab show.
Then, for each MIDI cue, set the MIDI Destination as the Patch you just set, where the desk is plugged in to.
MIDI Monitor is a great little free app that can intercept MIDI messages, and will tell you what's coming out of QLab and where it's being sent to - if QLab is sending out correctly, it could be a routing issue with the MOTU filtering or routing to a different output etc. Not familiar with anything recent by them, but my iConnectivity stuff is fairly comprehensive (read: Confusing!)).
Just tick everything on under Sources at the window's top in MIDI Monitor. It'll give you From and To info with the message and port stuff.