diff --git a/.gitignore b/.gitignore
index 6b468b6..ec6e61a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *.class
+lib/preferences.txt
diff --git a/bin/processing-commander b/bin/processing-commander
index 373a5e5..78b1e46 100755
--- a/bin/processing-commander
+++ b/bin/processing-commander
@@ -1,8 +1,16 @@
 #!/bin/bash
+set -e
+
 TOP="$(dirname $(dirname $(readlink -f -- "$0")))"
 
+$TOP/bin/prochome-check >/dev/null
+
+if [ ! -f "$TOP/lib/preferences.txt" ]; then
+    cp "$TOP/lib/preferences.txt.stub" "$TOP/lib/preferences.txt"
+fi
+
 CP="$CLASSPATH"
-CP="$TOP/lib/$(uname -a)/mbh-processing-practice.jar:$CP"
+CP="$TOP/lib/$(uname -m)/mbh-processing-practice.jar:$CP"
 for procjar in "lib/core" "lib/pde" "java/lib/tools" "java/lib/rt"
 do
     CP="$PROCESSING_HOME/$procjar.jar:$CP"
diff --git a/bin/prochome-check b/bin/prochome-check
index 3932b0c..bb39dc2 100755
--- a/bin/prochome-check
+++ b/bin/prochome-check
@@ -2,9 +2,9 @@
 
 if [ -z "$PROCESSING_HOME" ]; then
     cat >&2 <<EOM
-----------------------------------------------------------------------------
-  ERROR: You must define "\$PROCESSING_HOME" for the ant build to succeed.
-----------------------------------------------------------------------------
+----------------------------------------------
+  ERROR: You must define "\$PROCESSING_HOME"
+----------------------------------------------
 EOM
     exit 1
 else
diff --git a/lib/preferences.txt.stub b/lib/preferences.txt.stub
new file mode 100644
index 0000000..4522bc5
--- /dev/null
+++ b/lib/preferences.txt.stub
@@ -0,0 +1,67 @@
+console.auto_clear=true
+console.font.macosx=Monaco,plain,10
+console.font=Monospaced,plain,11
+console.length=500
+console.lines=4
+contribution.backup.on_install=true
+contribution.backup.on_remove=true
+editor.antialias.linux=true
+editor.antialias=true
+editor.divider.size=0
+editor.divider.size.windows=2
+editor.external=false
+editor.font.macosx=Monaco,plain,10
+editor.font=Monospaced,plain,12
+editor.indent=true
+editor.keys.alternative_cut_copy_paste.macosx=false
+editor.keys.alternative_cut_copy_paste=true
+editor.keys.home_and_end_travel_far=false
+editor.keys.home_and_end_travel_far.macosx=true
+editor.keys.home_and_end_travel_smart=true
+editor.keys.shift_backspace_is_delete=true
+editor.tabs.expand=true
+editor.tabs.size=2
+editor.untitled.prefix=sketch_
+editor.window.height.default=600
+editor.window.height.min=500
+editor.window.height.min.macosx=450
+editor.window.height.min.windows=530
+editor.window.width.default=500
+editor.window.width.min=400
+export.applet.separate_jar_files=false
+export.application.fullscreen=false
+export.application.platform.linux=true
+export.application.platform.macosx=true
+export.application.platform=true
+export.application.platform.windows=true
+export.application.stop=true
+export.delete_target_folder=true
+instance_server.key=0.3877576097235004
+instance_server.port=38596
+last.sketch.count=0
+last.sketch.restore=true
+launcher=xdg-open
+platform.auto_file_type_associations=true
+preproc.color_datatype=true
+preproc.enhanced_casting=true
+preproc.imports.list=java.applet.*,java.awt.Dimension,java.awt.Frame,java.awt.event.MouseEvent,java.awt.event.KeyEvent,java.awt.event.FocusEvent,java.awt.Image,java.io.*,java.net.*,java.text.*,java.util.*,java.util.zip.*,java.util.regex.*
+preproc.output_parse_tree=false
+preproc.save_build_files=false
+preproc.substitute_floats=true
+preproc.substitute_unicode=true
+preproc.web_colors=true
+run.display=1
+run.options=
+run.options.bits.macosx=32
+run.options.memory=false
+run.options.memory.initial=64
+run.options.memory.maximum=256
+run.present.bgcolor=#666666
+run.present.exclusive=false
+run.present.exclusive.macosx=true
+run.present.stop.color=#cccccc
+run.window.bgcolor=#DFDFDF
+sketchbook.path=/home/me/repos/practicing-processing.git/sketchbook
+update.check=true
+update.id=-5920873896785929326
+update.last=1325434363680
diff --git a/lib/x86_64/mbh-processing-practice.jar b/lib/x86_64/mbh-processing-practice.jar
index efc670e..e10e11b 100644
Binary files a/lib/x86_64/mbh-processing-practice.jar and b/lib/x86_64/mbh-processing-practice.jar differ