diff --git a/clients/apple/macOS/VoiceCatMac/Windows/ConnectWindowController.swift b/clients/apple/macOS/VoiceCatMac/Windows/ConnectWindowController.swift
index da25b87..6c04c83 100644
--- a/clients/apple/macOS/VoiceCatMac/Windows/ConnectWindowController.swift
+++ b/clients/apple/macOS/VoiceCatMac/Windows/ConnectWindowController.swift
@@ -18,6 +18,7 @@ final class ConnectWindowController: NSWindowController, NSWindowDelegate {
     private var servers: [SavedServer] = ServerListStore.load()
     private var client: VoiceCatClient?
     private var identityDialogShown = false
+    private var mainWindowController: MainWindowController?
 
     // MARK: - Init
 
@@ -298,6 +299,7 @@ final class ConnectWindowController: NSWindowController, NSWindowDelegate {
     private func authSucceeded(client: VoiceCatClient, selfUserId: UInt32, nickname: String) {
         client.onEvent = nil
         let mainWC = MainWindowController(client: client, selfUserId: selfUserId, nickname: nickname)
+        self.mainWindowController = mainWC
         mainWC.showWindow(nil)
         self.client = nil
         close()
diff --git a/clients/apple/macOS/VoiceCatMac/Windows/MainWindowController.swift b/clients/apple/macOS/VoiceCatMac/Windows/MainWindowController.swift
index ce26723..84d9dab 100644
--- a/clients/apple/macOS/VoiceCatMac/Windows/MainWindowController.swift
+++ b/clients/apple/macOS/VoiceCatMac/Windows/MainWindowController.swift
@@ -106,6 +106,10 @@ final class MainWindowController: NSWindowController, NSWindowDelegate {
 
     required init?(coder: NSCoder) { fatalError() }
 
+    deinit {
+        NSLog("[VoiceCatMac] MainWindowController deinit — client and event handlers are gone")
+    }
+
     // MARK: - UI construction
 
     private func buildUI() {
@@ -447,6 +451,10 @@ final class MainWindowController: NSWindowController, NSWindowDelegate {
         }
         ownPermissions = client.getPermissions()
 
+        NSLog("[VoiceCatMac] bootstrap: channels=%d users=%d perms{admin=%d kick=%d} currentChannelId=%u",
+              channels.count, allUsers.count,
+              ownPermissions.isAdmin, ownPermissions.canKick, currentChannelId)
+
         refreshChannelTree()
         refreshUserList()
         rebuildScopePicker()
@@ -459,6 +467,9 @@ final class MainWindowController: NSWindowController, NSWindowDelegate {
     // MARK: - Event handling
 
     private func handleEvent(_ event: VoiceCatEvent) {
+        NSLog("[VoiceCatMac] event type=%d result=%d userId=%u channelId=%u streamId=%u text=%@",
+              event.type.rawValue, event.result.rawValue, event.userId, event.channelId,
+              event.streamId, event.text ?? "(nil)")
         switch event.type {
         case .channelList:
             channels = client.listChannels()