Hello Melv, Unity Bug folks sent me a message saying the one-way collider stuff was fixed (bug 683964) in 5.1.1p2. I saw it in the release notes, but unfortunately the bug is still happening - in fact, it's even worse as the side-collision now happens regardless of what the player's Y velocity is (before it was only happening when Y was negative). You always collide with the sides now, when it should never. Any idea what's going on? Thanks.