diff --git a/src/main/exceptionHandler.js b/src/main/exceptionHandler.js
index 9f4afe06..c26fc2ef 100644
--- a/src/main/exceptionHandler.js
+++ b/src/main/exceptionHandler.js
@@ -27,7 +27,7 @@ const exceptionToString = (error, type) => {
   return `Version: ${global.MARKTEXT_VERSION_STRING || app.getVersion()}\n` +
     `OS: ${getOSInformation()}\n` +
     `Type: ${type}\n` +
-    `Date: ${new Date().toGMTString()}\n` +
+    `Date: ${new Date().toUTCString()}\n` +
     `Message: ${message}\n` +
     `Stack: ${stack}\n`
 }
diff --git a/src/main/index.js b/src/main/index.js
index 817036f8..7dff8d72 100644
--- a/src/main/index.js
+++ b/src/main/index.js
@@ -11,7 +11,7 @@ import setupEnvironment from './app/env'
 import { getLogLevel } from './utils'
 
 const initializeLogger = appEnvironment => {
-  log.transports.console.level = process.env.NODE_ENV === 'development' ? true : 'error'
+  log.transports.console.level = process.env.NODE_ENV === 'development' ? 'info' : 'error'
   log.transports.rendererConsole = null
   log.transports.file.resolvePath = () => path.join(appEnvironment.paths.logPath, 'main.log')
   log.transports.file.level = getLogLevel()
diff --git a/src/main/menu/actions/file.js b/src/main/menu/actions/file.js
index 046e2e04..6bd0431e 100644
--- a/src/main/menu/actions/file.js
+++ b/src/main/menu/actions/file.js
@@ -71,7 +71,7 @@ const handleResponseForExport = async (e, { type, content, pathname, title, page
         Object.assign(options, getPdfPageOptions(pageOptions))
         const data = await win.webContents.printToPDF(options)
         removePrintServiceFromWindow(win)
-        await writeFile(filePath, data, extension, {})
+        await writeFile(filePath, data, extension, 'binary')
       } else {
         if (!content) {
           throw new Error('No HTML content found.')
@@ -221,14 +221,14 @@ ipcMain.on('mt::save-and-close-tabs', async (e, unsavedFiles) => {
     Promise.all(unsavedFiles.map(file => handleResponseForSave(e, file)))
       .then(arr => {
         const tabIds = arr.filter(id => id != null)
-        win.send('mt::force-close-tabs-by-id', tabIds)
+        win.webContents.send('mt::force-close-tabs-by-id', tabIds)
       })
       .catch(err => {
-        log.error('Error while save all:', err.error)
+        log.error('Error while save all:', err)
       })
   } else {
     const tabIds = unsavedFiles.map(f => f.id)
-    win.send('mt::force-close-tabs-by-id', tabIds)
+    win.webContents.send('mt::force-close-tabs-by-id', tabIds)
   }
 })
 
diff --git a/src/main/preferences/index.js b/src/main/preferences/index.js
index 04b61710..a4f6f8d8 100644
--- a/src/main/preferences/index.js
+++ b/src/main/preferences/index.js
@@ -43,7 +43,7 @@ class Preference extends EventEmitter {
         defaultSettings.theme = 'dark'
       }
     } catch (err) {
-      log(err)
+      log.error(err)
     }
 
     if (!defaultSettings) {
diff --git a/src/main/windows/editor.js b/src/main/windows/editor.js
index 5745d8a6..1afd8d1d 100644
--- a/src/main/windows/editor.js
+++ b/src/main/windows/editor.js
@@ -203,7 +203,8 @@ class EditorWindow extends BaseWindow {
    * @param {boolean} [selected] Whether the tab should become the selected tab (true if not set).
    */
   openTab (filePath, options = {}, selected = true) {
-    if (this.lifecycle === WindowLifecycle.QUITTING) return
+    // TODO: Don't allow new files if quitting.
+    if (this.lifecycle === WindowLifecycle.QUITTED) return
     this.openTabs([{ filePath, options, selected }])
   }
 
@@ -226,7 +227,8 @@ class EditorWindow extends BaseWindow {
    * @param {{filePath: string, selected: boolean, options: any}[]} filePath A list of markdown file paths and options to open.
    */
   openTabs (fileList) {
-    if (this.lifecycle === WindowLifecycle.QUITTING) return
+    // TODO: Don't allow new files if quitting.
+    if (this.lifecycle === WindowLifecycle.QUITTED) return
 
     const { browserWindow } = this
     const { preferences } = this._accessor
@@ -259,6 +261,7 @@ class EditorWindow extends BaseWindow {
    * @param {[string]} markdown The markdown string.
    */
   openUntitledTab (selected = true, markdown = '') {
+    // TODO: Don't allow new files if quitting.
     if (this.lifecycle === WindowLifecycle.QUITTED) return
 
     if (this.lifecycle === WindowLifecycle.READY) {
@@ -275,6 +278,7 @@ class EditorWindow extends BaseWindow {
    * @param {string} pathname The directory path.
    */
   openFolder (pathname) {
+    // TODO: Don't allow new files if quitting.
     if (!pathname || this.lifecycle === WindowLifecycle.QUITTED ||
       isSamePathSync(pathname, this._openedRootDirectory)) {
       return
diff --git a/src/renderer/bootstrap.js b/src/renderer/bootstrap.js
index 09ea54af..07b2edb3 100644
--- a/src/renderer/bootstrap.js
+++ b/src/renderer/bootstrap.js
@@ -7,7 +7,7 @@ let exceptionLogger = s => console.error(s)
 
 const configureLogger = () => {
   const { debug, paths, windowId } = global.marktext.env
-  log.transports.console.level = process.env.NODE_ENV === 'development' // mirror to window console
+  log.transports.console.level = process.env.NODE_ENV === 'development' ? 'info' : false // mirror to window console
   log.transports.mainConsole = null
   log.transports.file.resolvePath = () => path.join(paths.logPath, `editor-${windowId}.log`)
   log.transports.file.level = debug ? 'debug' : 'info'