Were you attaching specific MIDI messages to scenes manually, or using the default messages that happen with every scene?
Did you start using surface roles in a multi surface setup? I have observed that for some reason the default messages are not sent when surface roles are in effect.
In the Allen and Heath Midi driver preferences panel you can see the connected status, and there are “lights” that blink with incoming and outgoing messages. That can tell you if the driver thinks any messages are being sent or received.
If the driver appears correct, you can assign a specific message to a scene or a soft key and see if that goes through.