diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index c123263852d..acce17baf87 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -69,6 +69,7 @@ function GETPOST($paramname,$check='',$method=0)
  */
 function dol_include_once($relpath)
 {
+	$res=false;
 	$res=@include_once(DOL_DOCUMENT_ROOT.$relpath);
 	if (! $res && defined('DOL_DOCUMENT_ROOT_ALT')) $res=@include_once(DOL_DOCUMENT_ROOT_ALT.$relpath);
 	return $res;
@@ -81,8 +82,13 @@ function dol_include_once($relpath)
  */
 function dol_require_once($relpath)
 {
-	$res=@require_once(DOL_DOCUMENT_ROOT.$relpath);
-	if (! $res && defined('DOL_DOCUMENT_ROOT_ALT')) $res=@require_once(DOL_DOCUMENT_ROOT_ALT.$relpath);
+	$res=false;
+	
+	// Forced to use file_exists otherwise there is a blank page
+	//$res=@require_once(DOL_DOCUMENT_ROOT.$relpath);
+	//if (! $res && defined('DOL_DOCUMENT_ROOT_ALT')) $res=@require_once(DOL_DOCUMENT_ROOT_ALT.$relpath);
+	$res=@require_once(dol_file_exists($relpath));
+	
 	return $res;
 }
 
@@ -93,14 +99,13 @@ function dol_require_once($relpath)
  */
 function dol_file_exists($path,$absolute=0)
 {
-	$res='';
+	$res=false;
 	
 	if ($absolute)
 	{
 		preg_match('/^([^<]+\.php)/i',$path,$regs);
-		$path = (! empty($regs[1]) ? $regs[1] : $path);
 		$res=DOL_URL_ROOT.$path;
-		if (defined('DOL_URL_ROOT_ALT') && ! file_exists(DOL_DOCUMENT_ROOT.$path)) $url=DOL_URL_ROOT_ALT.$path;
+		if (defined('DOL_URL_ROOT_ALT') && ! file_exists(DOL_DOCUMENT_ROOT.$regs[1])) $res=DOL_URL_ROOT_ALT.$path;
 	}
 	else
 	{