I've been having the same problem on my Z270F. All of a sudden the I/O shield RGB stopped working. It doesn't react to any changes in BIOS or AURA, even though I can still change the lights on my G.Skill RGB RAM in Aura.
There are also other threads in the forum (in the
X99 and the
X370 subforum) where people complain about LEDs not working anymore.
It would be really nice to know if this can be fixed by an AURA update in the future, or if the hardware is broken.