We’re working on an update for CORE to fix this, but I have heard that if you run CORE as an admin and disabling Windows Defender usually solves this issue. We should have the update to CORE that will address this ready soon though!
Do we know if / when Core will be able to do different RGB layers simultaneously so that we can have two effects running at the same time like in Corsair iCue and Razer Synapse?
So red in general might mean a power issue, are you using another cable? Annoying not all cables are usb 2.0, as in not all of the keyboard cables were rated for rgb keyboards, and the keyboard does need a usb 2.0 cable for more power.
Per device, RGB control seems to be lacking in core regardless of device. This is actually not limited to just the RGB though. I have a heck of a time getting different DPI settings for my MOPs for example because they all show as the same device. I can also use the same dongle (with extender) for the Golden Panda MOP and the Centauri SOP.
With many hoops you can get the DPI, and DPI color you want but once they are set if you want to make a change to one mouse you have to do them all over again - because Core doesn’t know better.