I haven't tried reorienting the camera and I can confirm that edge scrolling is acting very weird. For one it's not very sensitive, about half the time I have to move my mouse in and out (of the edge area) to get the scrolling to activate. Left side doesn't work for me though the corners mentioned in the OP do.
What I find most confusing is how it scrolls. It seems to follow the map not the camera, which means that when I move it "right", it looks like it's moving to the bottom-right because the map is at angle to the screen. It's very disorienting. I end up either zooming-in/out or dragging the map.