diff --git a/checkin_notes b/checkin_notes
index 6576b5389a..b76094f14d 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -2332,7 +2332,7 @@ Charlie 12 Mar 2007
         value to 2GB when the actual RAM size is > 2GB.  So use Mac-specific
         API Gestalt(gestaltPhysicalRAMSizeInMegabytes, &mem_size) and add a 
         #error statement to the old method to alert any porters if their 
-        platforms were using sysctl {CTL_HW, HW_PHYSMEM{.
+        platforms were using sysctl {CTL_HW, HW_PHYSMEM}.
 
     client/
         hostinfo_unix.C
@@ -2992,3 +2992,17 @@ David  2 Apr 2007
 		DlgAdvPreferences*
 	lib/
 		prefs.C
+
+Charlie 3 Apr 2007
+    - Mac: Change name of Postinstall.app to PostInstall.app to fix a problem 
+        on some Macs where the postinstall or postupgrade script failed to 
+        launch PostInstall.app due to the lower-case I.  I don't know why some 
+        Macs would be case-sensitive here while others aren't, but user feedback 
+        seems to confirm this problem.
+        
+    mac_build/
+        boinc.xcodeproj/
+            project.pbxproj
+    mac_installer/
+        release_boinc.sh
+        release_GridRepublic.sh
diff --git a/mac_build/boinc.xcodeproj/project.pbxproj b/mac_build/boinc.xcodeproj/project.pbxproj
index 2f8f0513ce..5a849db453 100755
--- a/mac_build/boinc.xcodeproj/project.pbxproj
+++ b/mac_build/boinc.xcodeproj/project.pbxproj
@@ -789,7 +789,7 @@
 		DD0C59590816573E00CEC5D7 /* Mac_Saver_ModuleView.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; name = Mac_Saver_ModuleView.h; path = ../clientgui/mac/Mac_Saver_ModuleView.h; sourceTree = SOURCE_ROOT; };
 		DD0C595A0816573E00CEC5D7 /* Mac_Saver_ModuleView.m */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.objc; name = Mac_Saver_ModuleView.m; path = ../clientgui/mac/Mac_Saver_ModuleView.m; sourceTree = SOURCE_ROOT; };
 		DD0C5A8A0816711400CEC5D7 /* boinc.tiff */ = {isa = PBXFileReference; lastKnownFileType = image.tiff; name = boinc.tiff; path = ../clientgui/mac/boinc.tiff; sourceTree = SOURCE_ROOT; };
-		DD1277B3081F3D67007B5DE1 /* Postinstall.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Postinstall.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		DD1277B3081F3D67007B5DE1 /* PostInstall.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = PostInstall.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		DD1277B5081F3D67007B5DE1 /* PostInstall-Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.xml; path = "PostInstall-Info.plist"; sourceTree = "<group>"; };
 		DD1277BE081F3E73007B5DE1 /* LoginItemAPI.c */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.c; name = LoginItemAPI.c; path = ../mac_installer/LoginItemAPI.c; sourceTree = SOURCE_ROOT; };
 		DD1277BF081F3E73007B5DE1 /* LoginItemAPI.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; name = LoginItemAPI.h; path = ../mac_installer/LoginItemAPI.h; sourceTree = SOURCE_ROOT; };
@@ -1262,7 +1262,7 @@
 				DD40CDF907F0386A0096C645 /* SystemMenu.bundle */,
 				DDAEC9E107FA583B00A7BC36 /* SetVersion */,
 				DD96AFF90811075000A06F22 /* BOINCSaver.saver */,
-				DD1277B3081F3D67007B5DE1 /* Postinstall.app */,
+				DD1277B3081F3D67007B5DE1 /* PostInstall.app */,
 				DD69FEE808416C1300C01361 /* boinc_cmd */,
 				DD6381EA0870DC9D007A2F8E /* MakeAppIcon_h */,
 				DD7748980A356C880025D05E /* SetUpSecurity */,
@@ -1733,7 +1733,7 @@
 			);
 			name = PostInstall;
 			productName = Installer;
-			productReference = DD1277B3081F3D67007B5DE1 /* Postinstall.app */;
+			productReference = DD1277B3081F3D67007B5DE1 /* PostInstall.app */;
 			productType = "com.apple.product-type.application";
 		};
 		DD1AFEA40A512D8700EE5B82 /* Install_BOINC */ = {
@@ -3685,7 +3685,7 @@
 					Carbon,
 				);
 				OTHER_REZFLAGS = "";
-				PRODUCT_NAME = Postinstall;
+				PRODUCT_NAME = PostInstall;
 				SECTORDER_FLAGS = "";
 				WARNING_CFLAGS = (
 					"-Wmost",
@@ -3718,7 +3718,7 @@
 					Carbon,
 				);
 				OTHER_REZFLAGS = "";
-				PRODUCT_NAME = Postinstall;
+				PRODUCT_NAME = PostInstall;
 				SECTORDER_FLAGS = "";
 				WARNING_CFLAGS = (
 					"-Wmost",
@@ -4576,7 +4576,7 @@
 					Carbon,
 				);
 				OTHER_REZFLAGS = "";
-				PRODUCT_NAME = Postinstall;
+				PRODUCT_NAME = PostInstall;
 				SECTORDER_FLAGS = "";
 				WARNING_CFLAGS = (
 					"-Wmost",
@@ -5189,7 +5189,7 @@
 					Carbon,
 				);
 				OTHER_REZFLAGS = "";
-				PRODUCT_NAME = Postinstall;
+				PRODUCT_NAME = PostInstall;
 				SECTORDER_FLAGS = "";
 				WARNING_CFLAGS = (
 					"-Wmost",
@@ -5224,7 +5224,7 @@
 					Carbon,
 				);
 				OTHER_REZFLAGS = "";
-				PRODUCT_NAME = Postinstall;
+				PRODUCT_NAME = PostInstall;
 				SECTORDER_FLAGS = "";
 				WARNING_CFLAGS = (
 					"-Wmost",
@@ -5673,7 +5673,7 @@
 					Carbon,
 				);
 				OTHER_REZFLAGS = "";
-				PRODUCT_NAME = Postinstall;
+				PRODUCT_NAME = PostInstall;
 				SECTORDER_FLAGS = "";
 				WARNING_CFLAGS = (
 					"-Wmost",
diff --git a/mac_installer/release_GridRepublic.sh b/mac_installer/release_GridRepublic.sh
index 658da4af56..cb0be4ea34 100644
--- a/mac_installer/release_GridRepublic.sh
+++ b/mac_installer/release_GridRepublic.sh
@@ -20,7 +20,7 @@
 ## 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 ##
-# Release Script for Macintosh GridRepublic Desktop 4/28/06 by Charlie Fenton
+# Release Script for Macintosh GridRepublic Desktop 4/3/07 by Charlie Fenton
 ##
 
 ## Usage:
@@ -97,7 +97,7 @@ sed -i "" s/"<VER_NUM>"/"$1.$2.$3"/g "${IR_PATH}/ReadMe.rtf"
 cp -fp mac_installer/postinstall "${IR_PATH}/"
 cp -fp mac_installer/postupgrade "${IR_PATH}/"
 
-cp -fpR "$BUILDPATH/Postinstall.app" "${IR_PATH}/"
+cp -fpR "$BUILDPATH/PostInstall.app" "${IR_PATH}/"
 
 mkdir -p "${PR_PATH}"
 mkdir -p "${PR_PATH}/Applications"
diff --git a/mac_installer/release_boinc.sh b/mac_installer/release_boinc.sh
index 15e379e359..450d9b1f1e 100644
--- a/mac_installer/release_boinc.sh
+++ b/mac_installer/release_boinc.sh
@@ -20,7 +20,7 @@
 ## 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 ##
-# Release Script for Macintosh BOINC Manager 9/21/06 by Charlie Fenton
+# Release Script for Macintosh BOINC Manager 4/3/07 by Charlie Fenton
 ##
 
 ## Usage:
@@ -79,7 +79,7 @@ sed -i "" s/"<VER_NUM>"/"$1.$2.$3"/g ../BOINC_Installer/Installer\ Resources/Rea
 cp -fp mac_installer/postinstall ../BOINC_Installer/Installer\ Resources/
 cp -fp mac_installer/postupgrade ../BOINC_Installer/Installer\ Resources/
 
-cp -fpR $BUILDPATH/Postinstall.app ../BOINC_Installer/Installer\ Resources/
+cp -fpR $BUILDPATH/PostInstall.app ../BOINC_Installer/Installer\ Resources/
 
 mkdir -p ../BOINC_Installer/Pkg_Root
 mkdir -p ../BOINC_Installer/Pkg_Root/Applications