diff --git a/Source/Modules/AppDelegate.swift b/Source/Modules/AppDelegate.swift
index a63a4e94..5ea0b4c8 100644
--- a/Source/Modules/AppDelegate.swift
+++ b/Source/Modules/AppDelegate.swift
@@ -29,7 +29,7 @@ import InputMethodKit
 
 @objc(AppDelegate)
 class AppDelegate: NSObject, NSApplicationDelegate, ctlNonModalAlertWindowDelegate,
-  FSEventStreamHelperDelegate
+  FSEventStreamHelperDelegate, NSUserNotificationCenterDelegate
 {
   func helper(_: FSEventStreamHelper, didReceive _: [FSEventStreamHelper.Event]) {
     // 拖 100ms 再重載，畢竟有些有特殊需求的使用者可能會想使用巨型自訂語彙檔案。
@@ -63,13 +63,25 @@ class AppDelegate: NSObject, NSApplicationDelegate, ctlNonModalAlertWindowDelega
     fsStreamHelper.delegate = nil
   }
 
+  func userNotificationCenter(_: NSUserNotificationCenter, shouldPresent _: NSUserNotification) -> Bool {
+    return true
+  }
+
   func applicationDidFinishLaunching(_: Notification) {
+    NSUserNotificationCenter.default.delegate = self
     // 一旦發現與使用者半衰模組的觀察行為有關的崩潰標記被開啟，就清空既有的半衰記憶資料檔案。
     if mgrPrefs.failureFlagForUOMObservation {
       mgrLangModel.clearUserOverrideModelData(.imeModeCHS)
       mgrLangModel.clearUserOverrideModelData(.imeModeCHT)
       mgrPrefs.failureFlagForUOMObservation = false
+      let userNotification = NSUserNotification()
+      userNotification.title = NSLocalizedString("vChewing", comment: "")
+      userNotification.informativeText =
+        "\(NSLocalizedString("vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability.", comment: ""))"
+      userNotification.soundName = NSUserNotificationDefaultSoundName
+      NSUserNotificationCenter.default.deliver(userNotification)
     }
+
     DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()) {
       IME.initLangModels(userOnly: false)
     }
diff --git a/Source/Modules/ControllerModules/InputState.swift b/Source/Modules/ControllerModules/InputState.swift
index 74026bc6..9bf30f6c 100644
--- a/Source/Modules/ControllerModules/InputState.swift
+++ b/Source/Modules/ControllerModules/InputState.swift
@@ -201,7 +201,8 @@ public enum InputState {
         let attributedString = NSMutableAttributedString(
           string: composingBufferConverted,
           attributes: [
-            .underlineStyle: NSUnderlineStyle.thick.rawValue,
+            /// 不能用 .thick，否則會看不到游標。
+            .underlineStyle: NSUnderlineStyle.single.rawValue,
             .markedClauseSegment: 0,
           ]
         )
@@ -212,7 +213,8 @@ public enum InputState {
       for (i, neta) in nodeValuesArray.enumerated() {
         attributedString.setAttributes(
           [
-            .underlineStyle: NSUnderlineStyle.thick.rawValue,
+            /// 不能用 .thick，否則會看不到游標。
+            .underlineStyle: NSUnderlineStyle.single.rawValue,
             .markedClauseSegment: i,
           ], range: NSRange(location: newBegin, length: neta.utf16.count)
         )
diff --git a/Source/Resources/Base.lproj/Localizable.strings b/Source/Resources/Base.lproj/Localizable.strings
index 3d21a518..7fdaca04 100644
--- a/Source/Resources/Base.lproj/Localizable.strings
+++ b/Source/Resources/Base.lproj/Localizable.strings
@@ -1,3 +1,5 @@
+"vChewing" = "vChewing";
+"vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability." = "vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability.";
 "About vChewing…" = "About vChewing…";
 "vChewing Preferences…" = "vChewing Preferences…";
 "Uninstallation" = "Uninstallation";
diff --git a/Source/Resources/en.lproj/Localizable.strings b/Source/Resources/en.lproj/Localizable.strings
index 3d21a518..7fdaca04 100644
--- a/Source/Resources/en.lproj/Localizable.strings
+++ b/Source/Resources/en.lproj/Localizable.strings
@@ -1,3 +1,5 @@
+"vChewing" = "vChewing";
+"vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability." = "vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability.";
 "About vChewing…" = "About vChewing…";
 "vChewing Preferences…" = "vChewing Preferences…";
 "Uninstallation" = "Uninstallation";
diff --git a/Source/Resources/ja.lproj/Localizable.strings b/Source/Resources/ja.lproj/Localizable.strings
index 1f01eb48..148db8cb 100644
--- a/Source/Resources/ja.lproj/Localizable.strings
+++ b/Source/Resources/ja.lproj/Localizable.strings
@@ -1,3 +1,5 @@
+"vChewing" = "威注音入力アプリ";
+"vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability." = "臨時記憶モジュールの観測行為による威注音入力アプリの意外中止は発生した。威注音入力アプリの無事利用のために、既存臨時記憶データは全てお消しした。";
 "About vChewing…" = "威注音について…";
 "vChewing Preferences…" = "入力機能設定…";
 "Uninstallation" = "入力アプリの卸除（おろしのぞき）";
diff --git a/Source/Resources/zh-Hans.lproj/Localizable.strings b/Source/Resources/zh-Hans.lproj/Localizable.strings
index c7a18167..2dc53355 100644
--- a/Source/Resources/zh-Hans.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hans.lproj/Localizable.strings
@@ -1,3 +1,5 @@
+"vChewing" = "威注音输入法";
+"vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability." = "威注音输入法的使用者半衰记忆模组在观测时崩溃，相关半衰记忆资料档案内容已全部清空。";
 "About vChewing…" = "关于威注音…";
 "vChewing Preferences…" = "威注音偏好设定…";
 "Uninstallation" = "卸除输入法";
diff --git a/Source/Resources/zh-Hant.lproj/Localizable.strings b/Source/Resources/zh-Hant.lproj/Localizable.strings
index 9f20e73e..09f9c864 100644
--- a/Source/Resources/zh-Hant.lproj/Localizable.strings
+++ b/Source/Resources/zh-Hant.lproj/Localizable.strings
@@ -1,3 +1,5 @@
+"vChewing" = "威注音輸入法";
+"vChewing crashed while handling previously loaded UOM observation data. These data files are cleaned now to ensure the usability." = "威注音輸入法的使用者半衰記憶模組在觀測時崩潰，相關半衰記憶資料檔案內容已全部清空。";
 "About vChewing…" = "關於威注音…";
 "vChewing Preferences…" = "威注音偏好設定…";
 "Uninstallation" = "卸除輸入法";