diff --git a/changelog.txt b/changelog.txt
index 2f13e0ef..98a94fd0 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -38,6 +38,7 @@ OPENSEADRAGON CHANGELOG
 * Margins option to push the home region in from the edges of the Viewer (#505)
 * Rect and Point toString() functions are now consistent: rounding values to nearest hundredth
 * Overlays appear in the DOM immediately on open or addOverlay (#507)
+* imageLoaderLimit now works (#544)
 
 1.2.0: (in progress)
 
diff --git a/src/viewer.js b/src/viewer.js
index e3964b3b..781af981 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -36,6 +36,7 @@
 
 // dictionary from hash to private properties
 var THIS = {};
+var nextHash = 1;
 
 /**
  *
@@ -89,7 +90,7 @@ $.Viewer = function( options ) {
 
         //internal state and dom identifiers
         id:             options.id,
-        hash:           options.hash || options.id,
+        hash:           options.hash || nextHash++,
 
         //dom nodes
         /**
diff --git a/test/viewport.js b/test/viewport.js
index 769f934f..c0eaf94b 100644
--- a/test/viewport.js
+++ b/test/viewport.js
@@ -3,7 +3,7 @@
 (function () {
     var viewer;
     var VIEWER_ID = "example";
-    var PREFIX_URL = "/build/openseadragon/images";
+    var PREFIX_URL = "/build/openseadragon/images/";
     var SPRING_STIFFNESS = 100; // Faster animation = faster tests
 
      module("viewport", {
@@ -425,9 +425,7 @@
                 return el.times(window_boundary);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.minus(pos_point).divide(viewport.getContainerSize().x * ZOOM_FACTOR).plus(VIEWER_PADDING);
             },
             method: 'windowToViewportCoordinates'
@@ -441,9 +439,7 @@
                 return el.times(viewer.source.dimensions.x);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.plus(pos_point).minus(VIEWER_PADDING.times(viewport.getContainerSize().x * ZOOM_FACTOR));
             },
             method: 'imageToWindowCoordinates'
@@ -458,9 +454,7 @@
                 return el.times(window_boundary);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.minus(pos_point).divide(viewport.getContainerSize().x * ZOOM_FACTOR).plus(VIEWER_PADDING);
             },
             method: 'windowToViewportCoordinates'
@@ -474,9 +468,7 @@
                 return el.times(viewer.source.dimensions.x);
             },
             getExpected: function(orig, viewport) {
-                var position, pos_point;
-                position = viewer.element.getBoundingClientRect();
-                pos_point = new OpenSeadragon.Point(position.top, position.left);
+                var pos_point = OpenSeadragon.getElementOffset(viewer.element);
                 return orig.minus(VIEWER_PADDING).times(viewport.getContainerSize().x * ZOOM_FACTOR).plus(pos_point);
             },
             method: 'viewportToWindowCoordinates'