fix for adding nodes with a DPI besides 72 causing offset.

release/scripts/startup/bl_operators/node.py

@@ -66,8 +66,12 @@ class NodeAddOperator():
 
         # convert mouse position to the View2D for later node placement
         if context.region.type == 'WINDOW':
+            # XXX, why use DPI for coords?
+            dpi_fac = context.user_preferences.system.dpi / 72.0
             space.cursor_location = v2d.region_to_view(event.mouse_region_x,
                                                        event.mouse_region_y)
+            space.cursor_location /= dpi_fac
+
         else:
             space.cursor_location = tree.view_center