I am having the same issue! I have the commander C31 and Crosshair VIII hero MB. LED works fine with the controller, but as soon as i press and hold the button for MB control. Only 1 LED on the fan lights up. I've noticed on aura sync settings addressable header 1 has 1 LED. I can not edit this. i try changing it to 18 (9 LED on each fan). click save, but it is still 1 LED. However ARGB header 2 can be changed to 18. So i switch the connector to my ARGB Header 2. and now all LED lights up and working. BUTTTTTT whenever i reboot or wake up pc from sleep, ARGB HEADER 2 LED is back to 1 and can not be changed, but this time ARB Header 1 can be changed. So everytime i boot or wake my pc up, i got to keep switching ARGB header which is a temporary fix but is annoying!.