My issue may or may not be related. I am not running Macaroon, but I have a custom art interface installed. While running the DK starter area if I mounted a horse for the "steal a horse" quest, or the dragon to kill the humans and ballistas, my hotbar would completely disappear. I assume that the artwork is messing it up as I have no bar mods installed. So everytime I ran into one of those quests I had to /console reloadui to get it to show up.

Very frustrating.