I think there is definitely a bug there at the moment. Sometimes the shift-drag of the view stops working and only the angle of the camera is changed. Not sure what makes it stop working but closing the plot and reopening it seems to rest it and it works again.
Also, I think what Hebbe meant was that Undo does not work on view changes, so if you drag the view around (and mess it up because the shift-drag stopped working) you cannot undo that.