Can I just add, that it's super, super annoying that If you don't have certain things on your hot bar at all, then the game automatically adds them every time you interact with your skills or the hot bar at all, even if the last thing you JUST did was to drag them all off.
It also resets them when you reload a game, if there's empty space for it to do so, even if you saved with the bars empty.
The few reloads that I've had to do during my recent throwing experiment, you might have noticed that I keep their bars empty. Every time I restart the game for a new play session, as well as any time I've had to reload, I have to go through and drag all of the skills off, again, and again, because it keeps putting them back on... It does this if I level up, it does it if I deselect memorised spells, it does it even if you have literally all of the hot bar options turned off to prevent it from adding anything at all to your bar...
Not to mention that, along with the persistent click bugs, dragging things off your bar creates a UI bug that makes nothing else targetable or selectable, and prevents tooltips from showing up until you come out to the play screen and forcefully deselect (nothing at all) with your right mouse. In the mean time it also lets you drag things around that can't be moved, and see them in full, like a dev world building tool (Like moving the door to the Zhent hideout around and looking at it in full) - though it doesn't let you *actually* do this (You can't 'place' the object you're waving about), just shows the mouse-attached image of it.