Until today, clicking and holding the right mouse button and dragging around the workspace made the viewpoint rotate around the model so you could see it from different angles. Now, it sort of works, but "swings" the whole workspace around and often the model goes out of view. It's hard to explain properly, but it's definitely not behaving like it did yesterday. I've messed with my mouse settings but they make no difference; in Meshmixer, everything rotates as it always did, so I don't think it's a hardware issue. Any idea what's happened?