I'm not sure if this is limited to quadwings and/or the desert, but that's where it happens for me. The problem is that it is extremely annoying to place it down, as most places it shows a red X, but in very small parts you can actually place it down. this might be due to uneven terrain, but even in places that are flat, or atleast supposed to be, it will almost never place unless i go looking around for them small areas where i do get a green arrowl. secondly, whenever i land on a slope my quadwing has the tendency to start rolling backwards, sometimes just once but i've had cases were it will roll backwards a distance of 50 or more. Anyone else experiencing this? or know of a way that this does not happen?