diff --git a/HISTORY.md b/HISTORY.md
index 79bbf04a..e5f83ef8 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -12,13 +12,18 @@ http://visjs.org
 
 - Fixed #1441: Height of subgroups not immediately updated after updating
   data in a DataSet or DataView.
-  
+- Fixed #1491: Problem using ctrl+drag in combination with using a `DataView`,
+  and an issue with ctrl+drag when using `snap: null`.
+
 ### Graph2d
 
 - Implemented a new option for `shaded.orientation` to always shade towards zero.
   Thanks @ludost.
 - Fixed support for using a `DataView` in Graph2d. Thanks @ludost.
 
+### DataSet
+- Fixed #1487: DataSet cannot remove an item with id `0` correctly.
+
 
 ## 2015-11-27, version 4.10.0
 
diff --git a/lib/DataSet.js b/lib/DataSet.js
index f4ca42ec..75cb316d 100644
--- a/lib/DataSet.js
+++ b/lib/DataSet.js
@@ -357,7 +357,7 @@ DataSet.prototype.get = function (args) {
   if (id != undefined) {
     // return a single item
     item = me._getItem(id, type);
-    if (filter && !filter(item)) {
+    if (item && filter && !filter(item)) {
       item = null;
     }
   }
@@ -704,7 +704,7 @@ DataSet.prototype._remove = function (id) {
   }
   else if (id instanceof Object) {
     var itemId = id[this._fieldId];
-    if (itemId && this._data[itemId]) {
+    if (itemId !== undefined && this._data[itemId]) {
       delete this._data[itemId];
       this.length--;
       return itemId;
diff --git a/lib/timeline/component/DataAxis.js b/lib/timeline/component/DataAxis.js
index 02593649..4a1291a3 100644
--- a/lib/timeline/component/DataAxis.js
+++ b/lib/timeline/component/DataAxis.js
@@ -59,7 +59,7 @@ function DataAxis (body, options, svg, linegraphOptions) {
   this.setOptions(options);
   this.width = Number(('' + this.options.width).replace("px",""));
   this.minWidth = this.width;
-  this.height = this.linegraphSVG.offsetHeight;
+  this.height = this.linegraphSVG.getBoundingClientRect().height;
   this.hidden = false;
 
   this.stepPixels = 25;
diff --git a/lib/timeline/component/ItemSet.js b/lib/timeline/component/ItemSet.js
index 4ec39bfb..edff2897 100644
--- a/lib/timeline/component/ItemSet.js
+++ b/lib/timeline/component/ItemSet.js
@@ -1248,7 +1248,7 @@ ItemSet.prototype._onDragStartAddItem = function (event) {
   var time = this.body.util.toTime(x);
   var scale = this.body.util.getScale();
   var step = this.body.util.getStep();
-  var start = snap ? snap(time, scale, step) : start;
+  var start = snap ? snap(time, scale, step) : time;
   var end = start;
 
   var itemData = {