diff --git a/Model/TagDataNode.cs b/Model/TagDataNode.cs
index 8c5a92f..db87a6c 100644
--- a/Model/TagDataNode.cs
+++ b/Model/TagDataNode.cs
@@ -319,7 +319,8 @@ namespace NBTExplorer.Model
                 };
 
                 if (FormRegistry.EditByteArray(data)) {
-                    Array.Copy(data.Data, tag.ToTagByteArray().Data, tag.ToTagByteArray().Length);
+                    tag.ToTagByteArray().Data = data.Data;
+                    //Array.Copy(data.Data, tag.ToTagByteArray().Data, tag.ToTagByteArray().Length);
                     IsDataModified = true;
                     return true;
                 }
@@ -345,6 +346,7 @@ namespace NBTExplorer.Model
                 };
 
                 if (FormRegistry.EditByteArray(data)) {
+                    iatag.Data = new int[data.Data.Length / 4];
                     for (int i = 0; i < iatag.Length; i++) {
                         iatag.Data[i] = BitConverter.ToInt32(data.Data, i * 4);
                     }
diff --git a/Windows/EditHex.Designer.cs b/Windows/EditHex.Designer.cs
index a971eab..d317a9d 100644
--- a/Windows/EditHex.Designer.cs
+++ b/Windows/EditHex.Designer.cs
@@ -30,9 +30,11 @@
             this.hexBox1 = new Be.Windows.Forms.HexBox();
             this.statusStrip1 = new System.Windows.Forms.StatusStrip();
             this._curPositionLabel = new System.Windows.Forms.ToolStripStatusLabel();
+            this._curElementLabel = new System.Windows.Forms.ToolStripStatusLabel();
             this._buttonCancel = new System.Windows.Forms.Button();
             this._buttonOK = new System.Windows.Forms.Button();
-            this._curElementLabel = new System.Windows.Forms.ToolStripStatusLabel();
+            this._space = new System.Windows.Forms.ToolStripStatusLabel();
+            this._insertStateLabel = new System.Windows.Forms.ToolStripStatusLabel();
             this.statusStrip1.SuspendLayout();
             this.SuspendLayout();
             // 
@@ -56,7 +58,9 @@
             // 
             this.statusStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
             this._curPositionLabel,
-            this._curElementLabel});
+            this._curElementLabel,
+            this._space,
+            this._insertStateLabel});
             this.statusStrip1.Location = new System.Drawing.Point(0, 333);
             this.statusStrip1.Name = "statusStrip1";
             this.statusStrip1.Size = new System.Drawing.Size(516, 22);
@@ -70,6 +74,13 @@
             this._curPositionLabel.Size = new System.Drawing.Size(100, 17);
             this._curPositionLabel.Text = "0000";
             // 
+            // _curElementLabel
+            // 
+            this._curElementLabel.Name = "_curElementLabel";
+            this._curElementLabel.Size = new System.Drawing.Size(59, 17);
+            this._curElementLabel.Text = "Element 0";
+            this._curElementLabel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            // 
             // _buttonCancel
             // 
             this._buttonCancel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
@@ -92,12 +103,17 @@
             this._buttonOK.UseVisualStyleBackColor = true;
             this._buttonOK.Click += new System.EventHandler(this._buttonOK_Click);
             // 
-            // _curElementLabel
+            // _space
             // 
-            this._curElementLabel.Name = "_curElementLabel";
-            this._curElementLabel.Size = new System.Drawing.Size(59, 17);
-            this._curElementLabel.Text = "Element 0";
-            this._curElementLabel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            this._space.Name = "_space";
+            this._space.Size = new System.Drawing.Size(253, 17);
+            this._space.Spring = true;
+            // 
+            // _insertStateLabel
+            // 
+            this._insertStateLabel.Name = "_insertStateLabel";
+            this._insertStateLabel.Size = new System.Drawing.Size(58, 17);
+            this._insertStateLabel.Text = "Overwrite";
             // 
             // HexEditor
             // 
@@ -126,5 +142,7 @@
         private System.Windows.Forms.Button _buttonCancel;
         private System.Windows.Forms.Button _buttonOK;
         private System.Windows.Forms.ToolStripStatusLabel _curElementLabel;
+        private System.Windows.Forms.ToolStripStatusLabel _space;
+        private System.Windows.Forms.ToolStripStatusLabel _insertStateLabel;
     }
 }
\ No newline at end of file
diff --git a/Windows/EditHex.cs b/Windows/EditHex.cs
index 55eef29..22340cf 100644
--- a/Windows/EditHex.cs
+++ b/Windows/EditHex.cs
@@ -36,7 +36,7 @@ namespace NBTExplorer.Windows
             _data = new byte[data.Length];
             Array.Copy(data, _data, data.Length);
 
-            _byteProvider = new FixedByteProvider(_data);
+            _byteProvider = new DynamicByteProvider(_data);
             _byteProvider.Changed += (o, e) => { _modified = true; };
 
             hexBox1.ByteProvider = _byteProvider;
@@ -44,6 +44,7 @@ namespace NBTExplorer.Windows
             hexBox1.HorizontalByteCountChanged += HexBox_HorizontalByteCountChanged;
             hexBox1.CurrentLineChanged += HexBox_CurrentLineChanged;
             hexBox1.CurrentPositionInLineChanged += HexBox_CurrentPositionInLineChanged;
+            hexBox1.InsertActiveChanged += HexBox_InsertActiveChanged;
 
             hexBox1.ReadOnly = false;
         }
@@ -73,6 +74,14 @@ namespace NBTExplorer.Windows
             UpdatePosition();
         }
 
+        private void HexBox_InsertActiveChanged (object sender, EventArgs e)
+        {
+            if (hexBox1.InsertActive)
+                _insertStateLabel.Text = "Insert";
+            else
+                _insertStateLabel.Text = "Overwrite";
+        }
+
         private void UpdatePosition ()
         {
             long pos = (hexBox1.CurrentLine - 1) * hexBox1.HorizontalByteCount + hexBox1.CurrentPositionInLine - 1;
@@ -83,9 +92,10 @@ namespace NBTExplorer.Windows
 
         private void Apply ()
         {
-            long len = Math.Min(_data.Length, _byteProvider.Length);
+            if (_data.Length != _byteProvider.Length)
+                _data = new byte[_byteProvider.Length];
 
-            for (int i = 0; i < len; i++) {
+            for (int i = 0; i < _data.Length; i++) {
                 _data[i] = _byteProvider.Bytes[i];
             }
 
diff --git a/Windows/FormHandlers.cs b/Windows/FormHandlers.cs
index 314e73c..d554808 100644
--- a/Windows/FormHandlers.cs
+++ b/Windows/FormHandlers.cs
@@ -60,6 +60,7 @@ namespace NBTExplorer.Windows
         {
             HexEditor form = new HexEditor(data.NodeName, data.Data, data.BytesPerElement);
             if (form.ShowDialog() == DialogResult.OK && form.Modified) {
+                data.Data = new byte[form.Data.Length];
                 Array.Copy(form.Data, data.Data, data.Data.Length);
                 return true;
             }