Index: app/models/custom_value.rb
===================================================================
--- app/models/custom_value.rb	(revision 4093)
+++ app/models/custom_value.rb	(working copy)
@@ -18,12 +18,24 @@
 class CustomValue < ActiveRecord::Base
   belongs_to :custom_field
   belongs_to :customized, :polymorphic => true
+  after_update :after_save_value
 
   def after_initialize
     if new_record? && custom_field && (customized_type.blank? || (customized && customized.new_record?))
       self.value ||= custom_field.default_value
     end
   end
+
+  # Update the parent project's updated on timestamp if the custom value
+  # attached to it has changed. This has been abstracted using callbacks
+  # due to a bug that causes :touch => true to hang on
+  # the polymorphic association.
+  def after_save_value
+    return unless self.changed?
+    if customized_type == "Project"
+      self.customized.touch
+    end
+  end
   
   # Returns true if the boolean custom value is true
   def true?