diff --git a/Source/Modules/PrefMgr_Core.swift b/Source/Modules/PrefMgr_Core.swift
index 4f662178..16b4bfb1 100644
--- a/Source/Modules/PrefMgr_Core.swift
+++ b/Source/Modules/PrefMgr_Core.swift
@@ -38,11 +38,7 @@ public class PrefMgr: PrefMgrProtocol {
   public var checkUpdateAutomatically: Bool
 
   @AppProperty(key: UserDef.kCassettePath.rawValue, defaultValue: "")
-  public var cassettePath: String {
-    didSet {
-      LMMgr.loadCassetteData()
-    }
-  }
+  public var cassettePath: String
 
   @AppProperty(key: UserDef.kUserDataFolderSpecified.rawValue, defaultValue: "")
   public var userDataFolderSpecified: String
diff --git a/Source/Modules/UIModules/PrefUI/VwrPrefPaneCassette.swift b/Source/Modules/UIModules/PrefUI/VwrPrefPaneCassette.swift
index 0ae9df9d..5c86f026 100644
--- a/Source/Modules/UIModules/PrefUI/VwrPrefPaneCassette.swift
+++ b/Source/Modules/UIModules/PrefUI/VwrPrefPaneCassette.swift
@@ -76,6 +76,7 @@ struct VwrPrefPaneCassette: View {
                     guard let url = Self.dlgOpenFile.url else { return }
                     if LMMgr.checkCassettePathValidity(url.path) {
                       PrefMgr.shared.cassettePath = url.path
+                      LMMgr.loadCassetteData()
                       tbxCassettePath = PrefMgr.shared.cassettePath
                       BookmarkManager.shared.saveBookmark(for: url)
                     } else {
diff --git a/Source/Modules/WindowControllers/CtlPrefWindow.swift b/Source/Modules/WindowControllers/CtlPrefWindow.swift
index 7aff64ab..77ab544a 100644
--- a/Source/Modules/WindowControllers/CtlPrefWindow.swift
+++ b/Source/Modules/WindowControllers/CtlPrefWindow.swift
@@ -324,6 +324,7 @@ class CtlPrefWindow: NSWindowController {
         guard let url = dlgOpenFile.url else { return }
         if LMMgr.checkCassettePathValidity(url.path) {
           PrefMgr.shared.cassettePath = url.path
+          LMMgr.loadCassetteData()
           BookmarkManager.shared.saveBookmark(for: url)
         } else {
           IMEApp.buzz()