I had the problem that the hub and the OFD were not on the same power source as the G-System that controls the hub via Midi. The SA devices were always powered up when entering the rehearsal room and switching the power on. The G-System is in my rack and connected to the Furman. Meaning, when entering the room, the SA devices were switched on before the rest. This then had the effect that the Midi-Light did not light up (took me some time to notice) and the problem then was that the G-System did not control the OFD. The OFD was just running as usual, two presets, no switching via Midi.
Now I've put everything into the rack and feed the SA devices from the same power supply and it works like a charm.
Just for other who maybe are incorporating the Midi thing into their pedalboards and therefore have a weird power supply strategy in the beginning - this might be a mistake to avoid.
Whenever the Midi Light (red) lights up, it should work.