--- loncom/interface/lonprintout.pm	2017/01/29 16:02:29	1.653
+++ loncom/interface/lonprintout.pm	2017/01/30 19:45:05	1.657
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Printout
 #
-# $Id: lonprintout.pm,v 1.653 2017/01/29 16:02:29 raeburn Exp $
+# $Id: lonprintout.pm,v 1.657 2017/01/30 19:45:05 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -3452,7 +3452,7 @@ ENDPART
         if ($env{'request.enc'}) {
             $url = &Apache::lonenc::encrypted($url); 
         }
-        $URLback = $url.($url =~ /\?/) ? '&':'?''.?symb='.$helper->{VARS}{'symb'};
+        $URLback = $url.($url =~ /\?/) ? '&':'?'.'symb='.$helper->{VARS}{'symb'};
     }
     #
     # Final adjustment of the font size:
@@ -3536,7 +3536,7 @@ ENDPART
 				'cgi.'.$identifier.'.role' => $perm{'pav'},
 				'cgi.'.$identifier.'.numberoffiles' => $#print_array,
 				'cgi.'.$identifier.'.studentnames' => $student_names,
-				'cgi.'.$identifier.'.backref' => $URLback,});
+				'cgi.'.$identifier.'.backref' => &escape($URLback),});
     &Apache::lonnet::appenv({"cgi.$identifier.user"    => $env{'user.name'},
 				"cgi.$identifier.domain"  => $env{'user.domain'},
 				"cgi.$identifier.courseid" => $cnum,