--- ./nx-X11/programs/Xserver/render/renderedge.c.X.original	2015-02-13 14:03:44.792440567 +0100
+++ ./nx-X11/programs/Xserver/render/renderedge.c	2015-02-10 19:13:13.592693823 +0100
@@ -143,6 +143,7 @@
     dx = x_bot - x_top;
     dy = y_bot - y_top;
     e->dy = dy;
+    e->dx = 0;
     if (dy)
     {
 	if (dx >= 0)