diff --git a/CHANGELOG.md b/CHANGELOG.md
index b195808..9867c63 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Release Notes
 
+## 1.4.6 (2018-11-23)
+
+* Warn about using .INO files that leads to the spurious problems with C/C++ IntelliSense service (issue [#400](https://github.com/platformio/platformio-vscode-ide/issues/400))
+* Use actual Python path when creating a virtual environment
+* Shutdown all PIO Home servers when can't start a new one
+* Better explanation about PIP issue on Windows
+
 ## 1.4.5 (2018-11-18)
 
 * Reduced startup-time using extension bundling
diff --git a/package.json b/package.json
index f9ed620..4e380d6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "platformio-ide",
-  "version": "1.4.5",
+  "version": "1.4.6",
   "publisher": "platformio",
   "engines": {
     "vscode": "^1.24.0"
@@ -576,6 +576,7 @@
   "devDependencies": {
     "@babel/core": "^7.1.6",
     "@types/node": "^8",
+    "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.4",
     "babel-plugin-transform-class-properties": "^6.24.1",
     "babel-preset-env": "^1.6.0",
@@ -590,7 +591,7 @@
   },
   "dependencies": {
     "fs-plus": "^3.0.0",
-    "platformio-node-helpers": "^3.5.1",
+    "platformio-node-helpers": "^3.5.3",
     "platformio-vscode-debug": "^1.2.5"
   },
   "extensionDependencies": [
diff --git a/src/installer/manager.js b/src/installer/manager.js
index 1e6f374..989cda1 100644
--- a/src/installer/manager.js
+++ b/src/installer/manager.js
@@ -10,7 +10,7 @@ import * as pioNodeHelpers from 'platformio-node-helpers';
 
 import { PIO_CORE_MIN_VERSION } from '../constants';
 import PythonPrompt from './python-prompt';
-import StateStorage from './state-storage';
+import StateStorage from '../state-storage';
 import vscode from 'vscode';
 
 
diff --git a/src/main.js b/src/main.js
index a12ccee..19ec8cf 100644
--- a/src/main.js
+++ b/src/main.js
@@ -16,6 +16,7 @@ import PIOHome from './home';
 import PIOTerminal from './terminal';
 import ProjectTasksTreeProvider from './views/project-tasks-tree';
 import QuickAccessTreeProvider from './views/quick-access-tree';
+import StateStorage from './state-storage';
 import TaskManager from './tasks';
 import path from 'path';
 import vscode from 'vscode';
@@ -34,6 +35,7 @@ class PlatformIOVSCodeExtension {
 
   async activate(context) {
     this.context = context;
+    this.stateStorage = new StateStorage(context.globalState);
     this.pioHome = new PIOHome();
     this.pioTerm = new PIOTerminal();
 
@@ -89,9 +91,13 @@ class PlatformIOVSCodeExtension {
 
     this.initToolbar({ ignoreCommands: this.getEnterpriseSetting('ignoreToolbarCommands') });
     this.initProjectIndexer();
-    await this.startPIOHome();
-    misc.maybeRateExtension(this.context.globalState);
+    this.startPIOHome();
+
+    misc.maybeRateExtension(this.stateStorage);
     misc.warnAboutConflictedExtensions();
+    this.subscriptions.push(
+      vscode.window.onDidChangeActiveTextEditor(editor => misc.warnAboutInoFile(editor, this.stateStorage))
+    );    
   }
 
   getConfig() {
diff --git a/src/misc.js b/src/misc.js
index ca2cf98..f08754c 100644
--- a/src/misc.js
+++ b/src/misc.js
@@ -10,10 +10,10 @@ import { CONFLICTED_EXTENSION_IDS } from './constants';
 import vscode from 'vscode';
 
 
-export async function maybeRateExtension(globalState) {
-  const momentoKey = 'rate-extension-state';
+export async function maybeRateExtension(stateStorage) {
+  const stateKey = 'rate-extension';
   const askAfterSessionNums = 13;
-  let state = globalState.get(momentoKey);
+  let state = stateStorage.getValue(stateKey);
   if (state && state.done) {
     return;
   }
@@ -26,7 +26,7 @@ export async function maybeRateExtension(globalState) {
 
   state.callCounter += 1;
   if (state.callCounter < askAfterSessionNums) {
-    globalState.update(momentoKey, state);
+    stateStorage.setValue(stateKey, state);
     return;
   }
 
@@ -34,7 +34,7 @@ export async function maybeRateExtension(globalState) {
     'If you enjoy using PlatformIO IDE for VSCode, would you mind taking a moment to rate it? ' +
     'It will not take more than one minute. Thanks for your support!',
     { title: 'Rate PlatformIO IDE Extension', isCloseAffordance: false },
-    { title: 'Remind me later', isCloseAffordance: false },
+    { title: 'Remind later', isCloseAffordance: false },
     { title: 'No, Thanks', isCloseAffordance: true }
   );
 
@@ -49,7 +49,7 @@ export async function maybeRateExtension(globalState) {
     default:
       state.callCounter = 0;
   }
-  globalState.update(momentoKey, state);
+  stateStorage.setValue(stateKey, state);
 }
 
 export async function warnAboutConflictedExtensions() {
@@ -62,10 +62,10 @@ export async function warnAboutConflictedExtensions() {
   const selectedItem = await vscode.window.showWarningMessage(
     `Conflicted extensions with IntelliSense service were detected (${conflicted.join(', ')}). ` +
     'Code-completion, linting and navigation will not work properly. ' +
-    'Please disable or uninstall them.',
+    'Please disable or uninstall them (Menu > View > Extensions).',
     { title: 'Show extensions', isCloseAffordance: false },
     { title: 'More details', isCloseAffordance: false },
-    { title: 'Remind me later', isCloseAffordance: true }
+    { title: 'Remind later', isCloseAffordance: true }
   );  
   switch (selectedItem ? selectedItem.title : undefined) {
     case 'More details':
@@ -75,4 +75,34 @@ export async function warnAboutConflictedExtensions() {
       vscode.commands.executeCommand('workbench.extensions.action.showEnabledExtensions');
       break;
   }  
+}
+
+export async function warnAboutInoFile(editor, stateStorage) {
+  if (!editor || !editor.document || !editor.document.fileName) {
+    return;
+  }
+  if (!editor.document.fileName.endsWith('.ino')) {
+    return;
+  } 
+  const stateKey = 'ino-warn-disabled';
+  if (stateStorage.getValue(stateKey)) {
+    return;
+  }
+
+  const selectedItem = await vscode.window.showWarningMessage(
+    'C/C++ IntelliSense service does not support .INO files. ' +
+    'It might lead to the spurious problems with code completion, linting, and debugging. ' +
+    'Please convert .INO sketch into the valid .CPP file.',
+    { title: 'Show instruction', isCloseAffordance: false },
+    { title: 'Do not show again', isCloseAffordance: false },
+    { title: 'Remind later', isCloseAffordance: true }
+  );  
+  switch (selectedItem ? selectedItem.title : undefined) {
+    case 'Show instruction':
+      vscode.commands.executeCommand('vscode.open', vscode.Uri.parse('http://bit.ly/ino2cpp'));
+      break;
+    case 'Do not show again':
+        stateStorage.setValue(stateKey, 1);
+      break;
+  }  
 }
\ No newline at end of file
diff --git a/src/installer/state-storage.js b/src/state-storage.js
similarity index 93%
rename from src/installer/state-storage.js
rename to src/state-storage.js
index 25db7d1..2faa8ba 100644
--- a/src/installer/state-storage.js
+++ b/src/state-storage.js
@@ -8,7 +8,7 @@
 
 export default class StateStorage {
 
-  constructor(globalState, stateKey) {
+  constructor(globalState, stateKey='miscStates') {
     this._globalState = globalState;
     this._stateKey = stateKey;
   }