Index: app/helpers/application_helper.rb
===================================================================
--- app/helpers/application_helper.rb	(revision 21221)
+++ app/helpers/application_helper.rb	(working copy)
@@ -574,7 +574,7 @@
       s << content_tag('option', "<< #{l(:label_me)} >>", :value => User.current.id)
     end
     groups = +''
-    collection.sort.each do |element|
+    collection.sort_by{|user|}.each do |element|
       selected_attribute = ' selected="selected"' if option_value_selected?(element, selected) || element.id.to_s == selected
       (element.is_a?(Group) ? groups : s) << %(<option value="#{element.id}"#{selected_attribute}>#{h element.name}</option>)
     end
Index: app/models/issue.rb
===================================================================
--- app/models/issue.rb	(revision 21221)
+++ app/models/issue.rb	(working copy)
@@ -948,7 +948,7 @@
     if assigned_to_id_was.present? && assignee = Principal.find_by_id(assigned_to_id_was)
       users << assignee
     end
-    users.uniq.sort
+    users.uniq.sort_by{|user|}
   end
 
   # Versions that the issue can be assigned to