HejI do believe you need to send a PC to the Hub directly prior to saving the scene, to tell the Hub which slot to go to. The Hub is reactive, not proactive, it's not going to be able to read back which program your MIDI controller boots up on.
With regard to not seeing changes, do all 3 of your connected pedals give a brief flash of their small Control LEDs when you tap the Scan button on the Hub?
HUB was connected to the PC when I tried. I can edit all 3 pedals through the Scenes at the App and can hear the live changes. For some reason when I try to use the MIDI controller it just doesn't seem to work properly