|As of 3.1.1, when using Dominoes with RedRange button icons seem to be bugged. Most of the time when then UI loads the icons of abilities on the action bars are not visible. The ability is definitely still on the action bar and usable, just something with the addon prevents the icon from being displayed. Sometimes a /reloadui will display a few icons. But if you were to move the displayed icon, the ability moves and the icon remains in place.
I'll notify the author of Dominoes of this as well, and let me know if you have any questions.