diff --git a/visualpython/js/com/com_Config.js b/visualpython/js/com/com_Config.js
index 3b136011..2744f577 100644
--- a/visualpython/js/com/com_Config.js
+++ b/visualpython/js/com/com_Config.js
@@ -850,7 +850,7 @@ define([
                             throw new Error('Error', response);
                         }
                     }).then(function (data) {
-                        resolve(data.info.version);
+                        resolve(data.info.version, data.releases);
                     }).catch(function(err) {
                         let errMsg = err.message;
                         if (errMsg.includes('Failed to fetch')) {
@@ -910,11 +910,27 @@ define([
                 packageName = 'jupyterlab-visualpython';
             }
             this.getPackageVersion(packageName).then(function(latestVersion) {
-                if (nowVersion === latestVersion) {
+                let showUpdater = false;
+                if (nowVersion !== latestVersion) {
+                    let nowVerParts = nowVersion.split('.').map(x => ~~x);
+                    let latVerParts = latestVersion.split('.').map(x => ~~x);
+                    if (packageName === 'visualpython') {
+                        // show updater only for notebook extension (for v2.5.0)
+                        for (var i = 0; i < nowVerParts.length; i++) {
+                            const a = nowVerParts[i];
+                            const b = latVerParts[i];
+                            if (a < b) {
+                                showUpdater = true;
+                                break;
+                            }
+                        }
+                    }
+                }
+                if (showUpdater === false) {
                     // if it's already up to date
                     // hide version update icon
                     $('#vp_versionUpdater').hide();
-                    if (background) {
+                    if (background === true) {
                         ;
                     } else {
                         let msg = com_util.formatString('Visual Python is up to date. ({0})', latestVersion);
diff --git a/visualpython/js/com/com_Kernel.js b/visualpython/js/com/com_Kernel.js
index 4282c1ad..3540d1f0 100644
--- a/visualpython/js/com/com_Kernel.js
+++ b/visualpython/js/com/com_Kernel.js
@@ -473,14 +473,27 @@ define([
         getLabNotebookPanel(){
             var mainWidgets = this.app.shell.widgets('main');
             var widget = mainWidgets.next();
-            while(widget){
-                if(widget.sessionContext){
+            while (widget) {
+                if (widget.sessionContext) {
                     var type = widget.sessionContext.type;
                     if(type == 'notebook' || type == 'console'){  //other wigets might be of type DocumentWidget
                         if (widget.isVisible){
                             return widget;
                         }
                     }
+                } else if (widget.value !== undefined && widget.done === false) {
+                    // for upper lab 4
+                    let widgetObj = widget.value;
+                    if (widgetObj.sessionContext) {
+                        var type = widgetObj.sessionContext.type;
+                        if(type == 'notebook' || type == 'console'){  //other wigets might be of type DocumentWidget
+                            if (widgetObj.isVisible){
+                                return widgetObj;
+                            }
+                        }
+                    }
+                } else if (widget.done === true) {
+                    break;
                 }
                 widget = mainWidgets.next();
             }
@@ -494,6 +507,14 @@ define([
             while (widget) {
                 if (widget.sessionContext) {
                     widgetList.push(widget);
+                } else if (widget.value !== undefined && widget.done === false) {
+                    // for upper lab 4
+                    let widgetObj = widget.value;
+                    if (widgetObj.sessionContext) {
+                        widgetList.push(widgetObj);
+                    }
+                } else if (widget.done === true) {
+                    break;
                 }
                 widget = mainWidgets.next();
             }
diff --git a/visualpython/js/com/com_interface.js b/visualpython/js/com/com_interface.js
index 4c12f1e5..cbdd11f5 100644
--- a/visualpython/js/com/com_interface.js
+++ b/visualpython/js/com/com_interface.js
@@ -145,7 +145,7 @@ define([
                     var widget = labConsole.widgets[0];
                     if (type === 'markdown') {
                         // add # before the lines
-                        command = '#' + command.split('\n').join('#');
+                        command = '#' + command.split('\n').join('\n#');
                     }
 
                     // execute or not
diff --git a/visualpython/js/loadVisualpython.js b/visualpython/js/loadVisualpython.js
index d7f57aa5..206f2d94 100644
--- a/visualpython/js/loadVisualpython.js
+++ b/visualpython/js/loadVisualpython.js
@@ -287,8 +287,10 @@ define([
         } else if (vpConfig.extensionType === 'lab' || vpConfig.extensionType === 'lite') {
             // LAB: if widget is ready or changed, ready for lab kernel connected, and restart vp
             vpLab.shell._currentChanged.connect(function(s1, value) {
-                var { newValue } = value;
-                vpLog.display(VP_LOG_TYPE.DEVELOP, 'jupyterlab shell currently changed', s1, value);
+                // var { newValue } = value;
+                // LAB 4.x: get currentWidget
+                var newValue = s1.currentWidget;
+                vpLog.display(VP_LOG_TYPE.DEVELOP, 'jupyterlab shell currently changed', s1, newValue);
                 // kernel restart for notebook and console
                 if (newValue && newValue.sessionContext) {
                     vpConfig.hideProtector();
diff --git a/visualpython/js/m_apps/Import.js b/visualpython/js/m_apps/Import.js
index 645114d8..bc0321d5 100644
--- a/visualpython/js/m_apps/Import.js
+++ b/visualpython/js/m_apps/Import.js
@@ -22,27 +22,27 @@ define([
 
     const importTemplates = {
         'data-analysis': [
-            { i0: 'numpy',  i1: 'np', type: 'module'},
-            { i0: 'pandas',  i1: 'pd', type: 'module'},
+            { i0: 'numpy',  i1: 'np', type: 'module', checked: 'checked'},
+            { i0: 'pandas',  i1: 'pd', type: 'module', checked: 'checked'},
             { 
                 i0: 'matplotlib.pyplot', i1: 'plt', type: 'module'
                 , include: [
                     '%matplotlib inline'
-                ]
+                ], checked: 'checked'
             },
-            { i0: 'seaborn', i1: 'sns', type: 'module'},
+            { i0: 'seaborn', i1: 'sns', type: 'module', checked: 'checked'},
             {
                 i0: 'plotly.express', i1: 'px', type: 'module'
                 , include: [
                     'from plotly.offline import init_notebook_mode',
                     'init_notebook_mode(connected=True)'
-                ], checked: false
+                ], checked: ''
             },
-            { i0: 'pyarrow', i1: 'pa', type: 'module', checked: false},
+            { i0: 'pyarrow', i1: 'pa', type: 'module', checked: ''},
         ],
         'machine-learning': [
-            { i0: 'sklearn.model_selection',  i1: 'train_test_split', type: 'function' },
-            { i0: 'sklearn',  i1: 'metrics', type: 'function' }
+            { i0: 'sklearn.model_selection',  i1: 'train_test_split', type: 'function', checked: 'checked' },
+            { i0: 'sklearn',  i1: 'metrics', type: 'function', checked: 'checked' }
         ]
     }
 
@@ -175,9 +175,9 @@ define([
             let that = this;
             libraries && libraries.forEach((lib, idx) => {
                 if (lib.type == 'function') {
-                    page.appendLine(that.templateForFunction(idx, lib.i0, lib.i1, lib.checked));
+                    page.appendLine(that.templateForFunction(idx, lib.i0, lib.i1, (lib.checked === 'checked' || lib.checked === true)));
                 } else {
-                    page.appendLine(that.templateForModule(idx, lib.i0, lib.i1, lib.checked));
+                    page.appendLine(that.templateForModule(idx, lib.i0, lib.i1, (lib.checked === 'checked' || lib.checked === true)));
                 }
             });
             page.appendLine('</tbody>');
@@ -246,7 +246,7 @@ define([
                 if (pacI0 == "") {
                     continue;
                 }
-                if (pacChecked) {
+                if (pacChecked === true) {
                     if (sbCode.toString().trim().length > 0) {
                         sbCode.appendLine();
                     }
@@ -270,7 +270,7 @@ define([
                     }
                 }
                 
-                importMeta.push({ i0: pacI0, i1: pacI1, type: pacType, checked: pacChecked });
+                importMeta.push({ i0: pacI0, i1: pacI1, type: pacType, checked: (pacChecked?'checked':'') });
             }
             this.state.importMeta = importMeta;
 
diff --git a/visualpython/lib/codemirror/lib/codemirror.css b/visualpython/lib/codemirror/lib/codemirror.css
index f4d5718a..0a80f68d 100644
--- a/visualpython/lib/codemirror/lib/codemirror.css
+++ b/visualpython/lib/codemirror/lib/codemirror.css
@@ -3,7 +3,7 @@
 .CodeMirror {
   /* Set height, width, borders, and global font properties here */
   font-family: monospace;
-  height: 300px;
+  /* height: 300px; */
   color: black;
   direction: ltr;
 }