--- loncom/homework/structuretags.pm	2006/04/20 19:07:09	1.352
+++ loncom/homework/structuretags.pm	2006/05/23 19:05:42	1.355
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # definition of tags that give a structure to a document
 #
-# $Id: structuretags.pm,v 1.352 2006/04/20 19:07:09 albertel Exp $
+# $Id: structuretags.pm,v 1.355 2006/05/23 19:05:42 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -160,6 +160,14 @@ sub page_start {
 	    $form_tag_start.=&Apache::edit::form_change_detection();
 	}
 	$form_tag_start.='>';
+
+	my $symb=&Apache::lonnet::symbread();
+	if ($symb =~ /\S/) {
+	    $symb=
+		&HTML::Entities::encode(&Apache::lonenc::check_encrypt($symb));
+	    $form_tag_start.=
+		'<input type="hidden" name="symb" value="'.$symb.'" />';
+	}
     }
     return ($page_start,$form_tag_start);
 }
@@ -331,9 +339,16 @@ Feedback Mode:
 }
 
 sub initialize_storage {
-    %Apache::lonhomework::results=();
-    %Apache::lonhomework::history=();
+    undef(%Apache::lonhomework::results);
+    undef(%Apache::lonhomework::history);
     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+    
+    # anonymous users (CODEd exams) have no data
+    if ($name eq 'anonymous' 
+	&& !defined($domain)) {
+	return;
+    }
+
     if ($env{'request.state'} eq 'construct' 
 	|| $symb eq ''
 	|| $Apache::lonhomework::type eq 'practice') {
@@ -353,6 +368,7 @@ sub initialize_storage {
 	%Apache::lonhomework::history=
 	    &Apache::lonnet::restore($symb,$courseid,$domain,$name);
     }
+
     #ignore error conditions
     my ($temp)=keys %Apache::lonhomework::history ;
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
@@ -598,7 +614,8 @@ sub start_problem {
 
     my $name= &get_resource_name($parstack,$safeeval);
     my ($result,$form_tag_start);
-    if ($target eq 'web' || $target eq 'webgrade' || $target eq 'tex') {
+    if ($target eq 'web' || $target eq 'webgrade' || $target eq 'tex'
+	|| $target eq 'edit') {
 	($result,$form_tag_start) =
 	    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
 			$name);