diff --git a/checkin_notes b/checkin_notes
index b3c91d0e98..b55ef17a73 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -8894,3 +8894,10 @@ Rom & Charlie    29 Oct 2008
         BOINCx64.ism
     win_build/
         sim.vcproj
+
+Charlie 30 Oct 2008
+    - MGR: Fix show / hide on Mac broken by previous changes.
+
+    clientgui/
+        BOINCBaseFrame.cpp, .h
+        BOINCGUIApp.cpp
diff --git a/clientgui/BOINCBaseFrame.cpp b/clientgui/BOINCBaseFrame.cpp
index c7c7277795..bc6bf64155 100644
--- a/clientgui/BOINCBaseFrame.cpp
+++ b/clientgui/BOINCBaseFrame.cpp
@@ -757,7 +757,7 @@ bool CBOINCBaseFrame::RestoreState() {
     return true;
 }
 
-/*
+
 bool CBOINCBaseFrame::Show(bool bShow) {
     if (bShow) {
         wxGetApp().ShowApplication(true);
@@ -768,9 +768,8 @@ bool CBOINCBaseFrame::Show(bool bShow) {
             }
         }
     }
-    return wxFrame::Show(show);
+    return wxFrame::Show(bShow);
 }
-*/
 
 
 int CBOINCBaseFrame::_GetCurrentViewPage() {
diff --git a/clientgui/BOINCBaseFrame.h b/clientgui/BOINCBaseFrame.h
index b52ded7b9a..0dfd71001f 100644
--- a/clientgui/BOINCBaseFrame.h
+++ b/clientgui/BOINCBaseFrame.h
@@ -91,7 +91,7 @@ public:
 
     void                ExecuteBrowserLink( const wxString& strLink );
 
-    //bool                Show( bool bShow = true );
+    bool                Show( bool bShow = true );
 
 protected:
 
diff --git a/clientgui/BOINCGUIApp.cpp b/clientgui/BOINCGUIApp.cpp
index dade2ca69d..af047e704e 100644
--- a/clientgui/BOINCGUIApp.cpp
+++ b/clientgui/BOINCGUIApp.cpp
@@ -746,6 +746,7 @@ void CBOINCGUIApp::FireReloadSkin() {
 
 bool CBOINCGUIApp::SetActiveGUI(int iGUISelection, bool bShowWindow) {
     CBOINCBaseFrame* pNewFrame = NULL;
+    CBOINCBaseFrame* pOldFrame = m_pFrame;
 
     // Create the new window
     if ((iGUISelection != m_iGUISelected) || !m_pFrame) {
@@ -774,18 +775,18 @@ bool CBOINCGUIApp::SetActiveGUI(int iGUISelection, bool bShowWindow) {
         if (pNewFrame) {
             SetTopWindow(pNewFrame);
 
+            // Store the new frame for future use
+            m_pFrame = pNewFrame;
+
             // Hide the old one if it exists
-            if (m_pFrame) m_pFrame->Hide();
+            if (pOldFrame) pOldFrame->Hide();
 
             // Show the new frame if needed, and prevent Mac OSX from
             // hiding the application
             if (pNewFrame && bShowWindow) pNewFrame->Show();
 
             // Delete the old one if it exists
-            if (m_pFrame) m_pFrame->Destroy();
-
-            // Store the new frame for future use
-            m_pFrame = pNewFrame;
+            if (pOldFrame) pOldFrame->Destroy();
         }
     }
 
@@ -889,18 +890,19 @@ bool CBOINCGUIApp::IsApplicationVisible() {
 /// @param bShow
 ///   true will show the process, false will hide the process.
 ///
+#ifdef __WXMAC__
 void CBOINCGUIApp::ShowApplication(bool bShow) {
-#ifndef __WXMAC__
-    bool b = bShow;
-    b = true;
-#else
     if (bShow) {
         SetFrontProcess(&m_psnCurrentProcess);
     } else {
         ShowHideProcess(&m_psnCurrentProcess, false);
     }
-#endif
 }
+#else
+void CBOINCGUIApp::ShowApplication(bool) {
+}
+#endif
+
 
 bool CBOINCGUIApp::IsModalDialogDisplayed() {
     if (m_bSafeMessageBoxDisplayed) return true;