rchady.diff

diff --git a/app/models/project.rb b/app/models/project.rb
index b97d365..d4a5508 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -389,7 +389,9 @@ class Project < ActiveRecord::Base
       # remove disabled modules
       enabled_modules.each {|mod| mod.destroy unless module_names.include?(mod.name)}
       # add new modules
-      module_names.each {|name| enabled_modules << EnabledModule.new(:name => name)}
+      module_names.each do |name|
+        enabled_modules << EnabledModule.new(:name => name) unless module_enabled? name
+      end
     else
       enabled_modules.clear
     end