Oblique Slice Render fails at 45 degree angles

Setting the oblique slice to f.ex (0,1,1,0) causes the render to fail and not display the slice, even though it is a valid slice. This is because the intersection algorithm cannot handle this case. The intersection algorithm looks for single intersection points along all edges, but in this case, the intersection is along a full edge. It should return intersections at the corners, but fails to report any intersections at all.