Word 2007 VSTO Add-in works perfectly when debugging, but not when setup deployed

using System;
using System.Windows.Forms;
using Microsoft.VisualStudio.Tools.Applications.Runtime;
using Word = Microsoft.Office.Interop.Word;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools;
using Microsoft.Office.Tools.Word;
 
namespace Word_2007_Pane
{
    public partial class ThisAddIn
    {
        CustomTaskPane pane;
        public Word.ApplicationClass word;
        Office.CommandBarButton button;
        PaneUserControl userControl;
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            word = (Word.ApplicationClass)Application;
            word.ApplicationEvents3_Event_NewDocument += new Microsoft.Office.Interop.Word.ApplicationEvents3_NewDocumentEventHandler(word_ApplicationEvents3_Event_NewDocument);
 
            userControl = new PaneUserControl();
            pane = (CustomTaskPane)this.CustomTaskPanes.Add(userControl, "Research");
 
            pane.Visible = true; 
 
            // Create CommandBarButton
            button = (Office.CommandBarButton)word.CommandBars["Standard"].Controls.Add(Office.MsoControlType.msoControlButton, missing, missing, missing, missing);
            button.Caption = "Office Suggest";
            button.Tag = "Office Suggest";
            button.FaceId = 255;
            button.Style = Microsoft.Office.Core.MsoButtonStyle.msoButtonIconAndCaption;
            button.Visible = true;
 
            button.Click += new Microsoft.Office.Core._CommandBarButtonEvents_ClickEventHandler(button_Click);
               
        }
 
        void button_Click(Microsoft.Office.Core.CommandBarButton Ctrl, ref bool CancelDefault)
        {
            try
            {
                pane.Visible = true;
            }
            catch
            {
 
            }
            //throw new Exception("The method or operation is not implemented.");
        }
 
        Word.DocumentClass document;
        void word_ApplicationEvents3_Event_NewDocument(Microsoft.Office.Interop.Word.Document Doc)
        {
            try
            {
                document = (Word.DocumentClass)Doc;
                pane.Visible = true;
               // userControl.Activate();
            }
            catch
            {
            }
        }
 
        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
            this.CustomTaskPanes.Remove(pane);
        }
 
 
 
        #region VSTO generated code
 
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }
 
        #endregion
    }
}

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