diff --git a/src/custom/lookandfeelwrapper.rb b/src/custom/lookandfeelwrapper.rb
index 9ac7fb1..77b9644 100644
--- a/src/custom/lookandfeelwrapper.rb
+++ b/src/custom/lookandfeelwrapper.rb
@@ -786,6 +786,7 @@ module ODDB
       :explain_sort,
       :compare_backbutton,
       :custom_tab_navigation,
+      :ddd_chart,
 			:external_css,
       :ajax,
 			:home_drugs,
@@ -793,6 +794,7 @@ module ODDB
 			:faq_link,
       :patinfos,
 			:sequences,
+			:price_history,
 			:ywesee_contact,
 		]
 		DISABLED = [ :atc_ddd, :legal_note, :navigation, :price_request ]
@@ -835,6 +837,14 @@ module ODDB
 				[8,0]	=>	:deductible, 
 			}	
 		end
+		PH_END = Date.new(2010,4,10)
+		def enabled?(event, default=false)
+		  if event == :price_history && @@today < PH_END
+		    true
+		  else
+		    super
+		  end
+		end
 		def explain_result_components
 			{
 				[0,1]	=>	:explain_original,
diff --git a/src/util/exporter.rb b/src/util/exporter.rb
index 23571e2..1935ce2 100644
--- a/src/util/exporter.rb
+++ b/src/util/exporter.rb
@@ -53,9 +53,11 @@ module ODDB
       export_doc_csv
       export_index_therapeuticus_csv
       export_price_history_csv
+=begin # inoperable atm.
       run_on_monthday(1) {
         export_fachinfo_pdf
       }
+=end
       nil
     end
     def export_helper(name)
diff --git a/src/util/persistence.rb b/src/util/persistence.rb
index 3fa6645..b1eabad 100644
--- a/src/util/persistence.rb
+++ b/src/util/persistence.rb
@@ -4,6 +4,10 @@
 require 'rockit/rockit'
 require 'odba'
 
+class Hash
+  alias :key :index
+end
+
 module ODBA
 	class Stub
 		def odba_replace(name=nil)
diff --git a/src/util/session.rb b/src/util/session.rb
index 85e5176..f4bedb3 100644
--- a/src/util/session.rb
+++ b/src/util/session.rb
@@ -16,6 +16,7 @@ module ODDB
 		DEFAULT_LANGUAGE = "de"
 		DEFAULT_STATE = State::Drugs::Init
 		DEFAULT_ZONE = :drugs
+		EXPIRES = 30 * 60
 		SERVER_NAME = 'www.oddb.org'
 		PERSISTENT_COOKIE_NAME = 'oddb-preferences'
 		QUERY_LIMIT = 5
diff --git a/src/view/drugs/price_history.rb b/src/view/drugs/price_history.rb
index 533c927..dda7944 100644
--- a/src/view/drugs/price_history.rb
+++ b/src/view/drugs/price_history.rb
@@ -56,7 +56,7 @@ class PriceHistoryList < HtmlGrid::List
   end
   def origins(model)
     collect_data(model, :origin).inject([]) do |memo, url_and_date|
-      url, date = url_and_date.split(' ')
+      url, date = url_and_date.to_s.split(' ')
       link = HtmlGrid::Link.new :origin, model, @session, self
       if match = /#{ODDB.config.bsv_archives}/u.match(url)
         url = "http://bag.e-mediat.net/SL2007.WEb.external/BSV_xls_20#{match[1]}.zip"