diff --git a/html/js/scripts.js b/html/js/scripts.js
index 6595ca986..614fdf067 100644
--- a/html/js/scripts.js
+++ b/html/js/scripts.js
@@ -3438,6 +3438,7 @@ function progress_bar_check(p_idx, p_taskid)
 
         new Ajax.Request("ajax_misc.php", {
             parameters: {gDossier: 0, task_id: p_taskid,op:"progressBar"},
+            method:"get",
             onSuccess: function (req) {
                 try 
                 {
diff --git a/include/class/document_export.class.php b/include/class/document_export.class.php
index ac632ddbf..fea8edc71 100644
--- a/include/class/document_export.class.php
+++ b/include/class/document_export.class.php
@@ -127,7 +127,7 @@ class Document_Export
         $cnt_feedback=0;
         global $cn;
         // follow progress
-        $step=round(20/count($p_array));
+        $step=round(16/count($p_array),2);
         
         $cn->start();
         foreach ($p_array as $value)
@@ -244,6 +244,7 @@ class Document_Export
             // concatenate detail operation with the output
             $stmt = PDFTK . " " . $detail_operation->get_pdf_filename()." ".$output. 
                     ' output ' . $output2;
+            
             $progress->increment($step);
             passthru($stmt, $status);
             if ($status <> 0)
@@ -264,15 +265,16 @@ class Document_Export
             // Move the PDF into another temp directory 
             $this->move_file($output, 'stamp_' . $file_pdf);
         }
+        
         $progress->set_value(93);
         // concatenate all pdf into one
         $this->concatenate_pdf();
         
-        $progress->set_value(100);
         
         ob_clean();
         $this->send_pdf();
 
+        $progress->set_value(100);
         // remove files from "conversion folder"
         $this->clean_folder();
         
diff --git a/include/lib/progress_bar.class.php b/include/lib/progress_bar.class.php
index 50b1d08d1..f459fc1ea 100644
--- a/include/lib/progress_bar.class.php
+++ b/include/lib/progress_bar.class.php
@@ -67,6 +67,7 @@ class Progress_Bar
             $this->value=0;
             $this->db->exec_sql("insert into progress(p_id,p_value) values ($1,0)",
                     [$p_task_id]);
+            $this->db->exec_sql("delete from progress where p_created < now() - interval '3 hours' ");
         }
     }
     /**
diff --git a/sql/upgrade.sql b/sql/upgrade.sql
index 21af50a23..1b7e8d87c 100644
--- a/sql/upgrade.sql
+++ b/sql/upgrade.sql
@@ -13,7 +13,7 @@ alter table jnt_use_dos add CONSTRAINT use_id_dos_id_uniq UNIQUE (use_id,dos_id)
 create table progress 
 (
     p_id varchar(16) primary key,
-    p_value integer not null ,
+    p_value numeric (5,2) not null ,
     p_created timestamp default now()
 );