Index: app/controllers/issues_controller.rb
===================================================================
--- app/controllers/issues_controller.rb	(revision 17682)
+++ app/controllers/issues_controller.rb	(working copy)
@@ -40,6 +40,7 @@
   helper :timelog
 
   def index
+    saved_column_names = session[:issue_query][:column_names]
     retrieve_query
 
     if @query.valid?
@@ -64,6 +65,7 @@
         format.csv  {
           @issues = @query.issues(:limit => Setting.issues_export_limit.to_i)
           send_data(query_to_csv(@issues, @query, params[:csv]), :type => 'text/csv; header=present', :filename => 'issues.csv')
+          session[:issue_query][:column_names] = saved_column_names
         }
         format.pdf  {
           @issues = @query.issues(:limit => Setting.issues_export_limit.to_i)