diff -r b0b53cbe695b -r 383d020a8af8 client/js/paper-renderer.js
--- a/client/js/paper-renderer.js	Sun Mar 17 02:25:56 2013 +0100
+++ b/client/js/paper-renderer.js	Sun Mar 17 20:50:30 2013 +0100
@@ -1741,7 +1741,7 @@
         if (this.click_target && typeof this.click_target.paperShift === "function") {
             this.click_target.paperShift(_event.delta);
         } else {
-            this.paperShift(_delta);
+            this.paperShift(_event.delta);
         }
     } else {
         this.findTarget(_hitResult);