Index: app/models/issue_query.rb
===================================================================
--- app/models/issue_query.rb	(Revision 16970)
+++ app/models/issue_query.rb	(Arbeitskopie)
@@ -272,7 +272,7 @@
   # Returns the issues
   # Valid options are :order, :offset, :limit, :include, :conditions
   def issues(options={})
-    order_option = [group_by_sort_order, (options[:order] || sort_clause)].flatten.reject(&:blank?)
+    order_option = ([options[:order]] || [group_by_sort_order, sort_clause]).flatten.reject(&:blank?)
 
     scope = Issue.visible.
       joins(:status, :project).
Index: app/controllers/calendars_controller.rb
===================================================================
--- app/controllers/calendars_controller.rb	(Revision 16970)
+++ app/controllers/calendars_controller.rb	(Arbeitskopie)
@@ -38,11 +38,11 @@
 
     @calendar = Redmine::Helpers::Calendar.new(Date.civil(@year, @month, 1), current_language, :month)
     retrieve_query
-    @query.group_by = nil
     if @query.valid?
       events = []
       events += @query.issues(:include => [:tracker, :assigned_to, :priority],
-                              :conditions => ["((start_date BETWEEN ? AND ?) OR (due_date BETWEEN ? AND ?))", @calendar.startdt, @calendar.enddt, @calendar.startdt, @calendar.enddt]
+                              :conditions => ["((start_date BETWEEN ? AND ?) OR (due_date BETWEEN ? AND ?))", @calendar.startdt, @calendar.enddt, @calendar.startdt, @calendar.enddt],
+                              :order => []
                               )
       events += @query.versions(:conditions => ["effective_date BETWEEN ? AND ?", @calendar.startdt, @calendar.enddt])
 
Index: app/controllers/gantts_controller.rb
===================================================================
--- app/controllers/gantts_controller.rb	(Revision 16970)
+++ app/controllers/gantts_controller.rb	(Arbeitskopie)
@@ -32,7 +32,6 @@
     @gantt = Redmine::Helpers::Gantt.new(params)
     @gantt.project = @project
     retrieve_query
-    @query.group_by = nil
     @gantt.query = @query if @query.valid?
 
     basename = (@project ? "#{@project.identifier}-" : '') + 'gantt'