diff --git a/checkin_notes b/checkin_notes
index 8002cdf9aa..aa64ec5b2d 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -8186,3 +8186,10 @@ Rom    2 Dec 2010
     /
         configure.ac
         version.h
+
+Charlie 6 Dec 2010
+    - Mac Installer: Fix failure to auto-launch on OS 10.4.x.
+    
+    mac_installer/
+        postinstall
+        postupgrade
diff --git a/mac_installer/postinstall b/mac_installer/postinstall
index 8a99ee3fb5..4df8333ede 100644
--- a/mac_installer/postinstall
+++ b/mac_installer/postinstall
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 ##
-# post-Install Script for Macintosh BOINC Manager for OS X revised 11/22/10
+# post-Install Script for Macintosh BOINC Manager for OS X revised 12/6/10
 ##
 
 echo "initial directory = $PWD"
@@ -21,9 +21,11 @@ fi
 if [ "${COMMAND_LINE_INSTALL}" = "1" ]; then
 rm -f /tmp/BOINCInstallLog.txt
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part1 >> /tmp/BOINCInstallLog.txt
+sleep 2
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part2 & >> /tmp/BOINCInstallLog.txt
 else
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part1
+sleep 2
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part2 &
 fi
 
diff --git a/mac_installer/postupgrade b/mac_installer/postupgrade
index 583577652b..02dd0d61c2 100755
--- a/mac_installer/postupgrade
+++ b/mac_installer/postupgrade
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 ##
-# post-Upgrade Script for Macintosh BOINC Manager for OS X revised 11/22/10
+# post-Upgrade Script for Macintosh BOINC Manager for OS X revised 12/6/10
 ##
 
 echo "initial directory = $PWD"
@@ -21,9 +21,11 @@ fi
 if [ "${COMMAND_LINE_INSTALL}" = "1" ]; then
 rm -f /tmp/BOINCInstallLog.txt
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part1 >> /tmp/BOINCInstallLog.txt
+sleep 2
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part2 & >> /tmp/BOINCInstallLog.txt
 else
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part1
+sleep 2
 Contents/Resources/PostInstall.app/Contents/MacOS/PostInstall -part2 &
 fi