I just had a very similar issue. This is what fixed it for me, give it a try and see if it helps...
In Armory Crate, go to the top left option "Device" (Looks like icon of mouse and keyboard).
Then go to "Addressable Headers" tab on the top.
There you will see Strip options with Number of LEDs. Both mine were set at 120.
So, I changed the number of LEDs to 60 on the header I was using, and it started working again. I then changed it back to 120, it applied the setting, and it still works normally.
So whatever this did reset things to work again even though the setting isn't changed at all.
Or maybe play around with adjusting the # of LEDs. Good luck.
my ROG-Build runs fine so far. My Components are:
Crosshair VIII Formula
Last week the system found a new home in its Strix Helios Case... Unfortunately I can't get the LED Panel to work with AC
As shown in my attachment all components are listed and synced fine, except my Helios Case. The Front Plate remains dark in MB-Mode.
All drivers are up to date, AC updated to 18.104.22.168
The Helios Case is connected to the motherboards a-rgb connector.
I have no idea, what might be the problem here - any suggestions to fix it?
Thanks in advance and have a nice day!