diff --git a/checkin_notes b/checkin_notes
index 9736fc1976..4af8e18f0e 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -175,3 +175,15 @@ Charlie  7 Jan 2010
     lib/
         mac/
             mac_backtrace.C
+
+Charlie  7 Jan 2010
+    - Mac: Fix bug in backtrace code which showed up only under OS 10.6.
+    - Mac installer: Add CUDA information to Mac ReadMe files.
+
+    lib/
+        mac/
+            mac_backtrace.C
+    mac_installer/
+        GR-ReadMe.rtf
+        PTP-ReadMe.rtf
+        ReadMe.rtf
diff --git a/mac_installer/GR-ReadMe.rtf b/mac_installer/GR-ReadMe.rtf
index 5e751f0b3e..b4cc696fce 100644
--- a/mac_installer/GR-ReadMe.rtf
+++ b/mac_installer/GR-ReadMe.rtf
@@ -12,8 +12,9 @@
 \cf0 http://gridrepublic.org\
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 \cf0 \
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 
-\b Installing GridRepublic Desktop may take several minutes; please be patient.
+\b \cf0 Installing GridRepublic Desktop may take several minutes; please be patient.
 \b0 \
 \
 If you are upgrading from a version earlier than 6.8.0, you may see a message "Failed to convert file GridRepublic Desktop Preferences to Unicode."  This is due to our addition of full Unicode support to the GridRepublic Desktop.  If you get this message, you may need to readjust your column widths and other GridRepublic Desktop view options, but no other problems will result.  When  you quit GridRepublic Desktop, these settings will be saved in the new Unicode format.\
@@ -24,6 +25,8 @@ For more options, please see the BOINC Macintosh administrator tools at:\
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 {\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X"}}{\fldrslt \cf0 http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X}}\
 \
+GridRepublic Desktop on the Mac now supports processing with your graphics card, or GPU.  Please see {\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/gpu.php"}}{\fldrslt http://boinc.berkeley.edu/gpu.php}} for more information.   If you have a CUDA-capable NVIDIA GPU, you will need to download and install the CUDA driver and libraries for your system from {\field{\*\fldinst{HYPERLINK "http://www.nvidia.com/object/cuda_get.html"}}{\fldrslt http://www.nvidia.com/object/cuda_get.html}}.\
+\
 Starting with version 5.5.4, this software features new, stricter security measures.  See the 
 \b Security
 \b0  section below for important information.\
diff --git a/mac_installer/PTP-ReadMe.rtf b/mac_installer/PTP-ReadMe.rtf
index aa6bedfa8e..81b25be914 100644
--- a/mac_installer/PTP-ReadMe.rtf
+++ b/mac_installer/PTP-ReadMe.rtf
@@ -12,8 +12,9 @@
 \cf0 http://gridrepublic.org\
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 \cf0 \
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 
-\b Installing ProgressThruProcessors Desktop may take several minutes; please be patient.
+\b \cf0 Installing ProgressThruProcessors Desktop may take several minutes; please be patient.
 \b0 \
 \
 If you are upgrading from a version earlier than 6.8.0, you may see a message "Failed to convert file ProgressThruProcessors Desktop Preferences to Unicode."  This is due to our addition of full Unicode support to the ProgressThruProcessors Desktop.  If you get this message, you may need to readjust your column widths and other ProgressThruProcessors Desktop view options, but no other problems will result.  When  you quit ProgressThruProcessors Desktop, these settings will be saved in the new Unicode format.\
@@ -24,6 +25,8 @@ For more options, please see the BOINC Macintosh administrator tools at:\
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 {\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X"}}{\fldrslt \cf0 http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X}}\
 \
+ProgressThruProcessors Desktop on the Mac now supports processing with your graphics card, or GPU.  Please see {\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/gpu.php"}}{\fldrslt http://boinc.berkeley.edu/gpu.php}} for more information.   If you have a CUDA-capable NVIDIA GPU, you will need to download and install the CUDA driver and libraries for your system from {\field{\*\fldinst{HYPERLINK "http://www.nvidia.com/object/cuda_get.html"}}{\fldrslt http://www.nvidia.com/object/cuda_get.html}}.\
+\
 Starting with version 5.5.4, this software features new, stricter security measures.  See the 
 \b Security
 \b0  section below for important information.\
diff --git a/mac_installer/ReadMe.rtf b/mac_installer/ReadMe.rtf
index 61b27a46da..e3631f58ca 100644
--- a/mac_installer/ReadMe.rtf
+++ b/mac_installer/ReadMe.rtf
@@ -24,6 +24,8 @@ For more options, please see the BOINC Macintosh administrator tools at:\
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 {\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X"}}{\fldrslt \cf0 http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X}}\
 \
+BOINC on the Mac now supports processing with your graphics card, or GPU.  Please see {\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/gpu.php"}}{\fldrslt http://boinc.berkeley.edu/gpu.php}} for more information.   If you have a CUDA-capable NVIDIA GPU, you will need to download and install the CUDA driver and libraries for your system from {\field{\*\fldinst{HYPERLINK "http://www.nvidia.com/object/cuda_get.html"}}{\fldrslt http://www.nvidia.com/object/cuda_get.html}}.\
+\
 Starting with version 5.5.4, BOINC features new, stricter security measures.  See the 
 \b Security
 \b0  section below for important information.\