Just a heads up for some folks having issues. I had recently purchased the Vengeance RGB 32gb kit in Black (2x16), After seeing how good it looked, it only seemed reasonable that I fill out the other 2 slots. I was pleasantly suprised to find the lighting kit available, as I certainly don't need another 32gb for my computing requirements.
When I first installed the sticks and booted up my system, it did not recognize them at all. It only showed me as having two sticks installed. However, in the iCue settings tab, there is an option at the bottom to "Restart iCue Service."
After clicking this, it took a few seconds to reset everything and all my existing RGB settings for my RAM turned off. This allowed the lighting enhancement sticks to appear in the app and I was able to set them to match. Hope this helps someone running into a similar issue.