Index: app/views/sprints/show.html.erb
===================================================================
--- app/views/sprints/show.html.erb	(revision 2)
+++ app/views/sprints/show.html.erb	(working copy)
@@ -8,6 +8,7 @@
            :locals => {:project => @project, :sprint => @sprint, :path => method(:sprint_path)} %>
 
 <%- sprint_board_id = 'sprint_board' -%>
+<% cache [ "v4", @sprint ] do %>
 <table class="sprint-board">
   <thead class="sprint-board">
     <tr class="sprint-board">
@@ -26,6 +27,7 @@
     <%- end -%>
   </tbody>
 </table>
+<% end %>
 
 <%- if User.current.allowed_to?(:add_issues, @project) and
        User.current.allowed_to?(:edit_sprint_board, @project) and
Index: init.rb
===================================================================
--- init.rb	(revision 2)
+++ init.rb	(working copy)
@@ -24,6 +24,7 @@
 Query.send(:include, Scrum::QueryPatch)
 Tracker.send(:include, Scrum::TrackerPatch)
 User.send(:include, Scrum::UserPatch)
+TimeEntry.send(:include, Scrum::TimeEntryPatch)
 
 require_dependency 'scrum/helper_hooks'
 require_dependency 'scrum/view_hooks'
Index: lib/scrum/issue_patch.rb
===================================================================
--- lib/scrum/issue_patch.rb	(revision 2)
+++ lib/scrum/issue_patch.rb	(working copy)
@@ -12,7 +12,7 @@
     def self.included(base)
       base.class_eval do
 
-        belongs_to :sprint
+        belongs_to :sprint, :touch => true
         has_many :pending_efforts, -> { order('date ASC') }
 
         acts_as_list :scope => :sprint
@@ -35,6 +35,9 @@
           (issue.status_id_changed? or issue.new_record?) and
           issue.is_task? and !issue.parent_id.nil?
         }
+        before_save :touch_sprint, :if => lambda { |issue|
+          issue.project.scrum?
+        }
 
         def has_story_points?
           ((!((custom_field_id = Scrum::Setting.story_points_custom_field_id).nil?)) and
@@ -390,6 +393,17 @@
           end
         end
 
+        def touch_sprint
+          if sprint
+            sprint.touch
+            sprint.save!
+          end
+          if (old_sprint = Sprint.find_by_id(sprint_id_was))
+            old_sprint.touch
+            old_sprint.save!
+          end
+        end
+
         def min_position
           min = nil
           unless sprint.nil?
Index: lib/scrum/time_entry_patch.rb
===================================================================
--- lib/scrum/time_entry_patch.rb	(nonexistent)
+++ lib/scrum/time_entry_patch.rb	(working copy)
@@ -0,0 +1,31 @@
+# Copyright © Emilio González Montaña
+# Licence: Attribution & no derivates
+#   * Attribution to the plugin web page URL should be done if you want to use it.
+#     https://redmine.ociotec.com/projects/redmine-plugin-scrum
+#   * No derivates of this plugin (or partial) are allowed.
+# Take a look to licence.txt file at plugin root folder for further details.
+
+require_dependency 'time_entry'
+
+module Scrum
+  module TimeEntryPatch
+    def self.included(base)
+      base.class_eval do
+
+        before_save :touch_issue, :if => lambda { |issue|
+          issue.project.scrum?
+        }
+
+      private
+
+        def touch_issue
+          if issue
+            issue.touch
+            issue.save!
+          end
+        end
+
+      end
+    end
+  end
+end
\ No newline at end of file