[canadagoose]

I've got a very strange problem –*certain objects in a diagram that I've put together with OG v 4.2.3 cannot be grouped, and when I try to move them individually with the arrow keys, they move in the opposite directions to the keys I'm pressing...! I cannot see any difference in properties between these objects and the ones that are behaving normally, but assume I'm missing something basic here. Any ideas much appreciated...