Same problem for me. I'm changing presets of my nano cortex and hx one with my graviton M2 midi controler with the hx one effect OFF by default.
when I put effect on with the hx one the Flux works, but when I put effect on with the midi controler Flux is not working anymore...
My midi comands for exemple : on Nano Cortex : PC10 and on Hx One : PC10 and CC1 with 0 value to put effect on and off
And I'm with the last firmware 3.81