Oooh, yeah. This really bothered me too! Its behaviour is really intuitive when you strat with a drag from the middle, but even starting on the edge of the pink

Oooh, yeah. This really bothered me too! Its behaviour is really intuitive when you strat with a drag from the middle, but even starting on the edge of the pink cube really makes it freak out. This essentially forces you to start from the middle, but then you don't seem to be able to do any rotation around the axis pointing out of the screen. To do that rotation your best bet is to click and drag around an inscribed circle - but that in turn means you can't rotate around any other axis in the same movement without running into freak-out behaviour. And anything between those two extremes doesn't really behave intuitively.