nodes should be placed withing the graph editor area.

dream/platform/static/css/demo-new.css

@@ -87,6 +87,7 @@ li { margin: 3px;
 #render {
     text-align: center;
     background-color:white;
+    position: relative;
 }
 
 #render ul {

dream/platform/static/src/dream_launcher.js

@@ -210,6 +210,7 @@
     dream_instance = Dream(configuration);
     dream_instance.start();
     $(".tool").draggable({
+      containment: '#render',
       opacity: 0.7,
       helper: "clone",
       cursorAt: {

dream/platform/static/src/jsonPlumb.js

@@ -191,8 +191,8 @@
         size_x = node_style['width'].replace('px', '');
         size_y = node_style['height'].replace('px', '');
       }
-      var top = y.replace('px', '') / (canvas_size_y - size_y);
-      var left = x.replace('px', '') / (canvas_size_x - size_x);
+      var top = Math.max(Math.min(y.replace('px', '') / (canvas_size_y - size_y), 1), 0);
+      var left = Math.max(Math.min(x.replace('px', '') / (canvas_size_x - size_x), 1), 0);
       return [left, top];
     };
 
@@ -212,6 +212,7 @@
       };
 
       jsPlumb.draggable(jsPlumb.getSelector(".window"), {
+        containment: 'parent',
         grid: [10, 10],
         stop: stop
       });