--- loncom/homework/structuretags.pm	2003/03/05 16:25:57	1.153
+++ loncom/homework/structuretags.pm	2003/03/14 23:23:45	1.156
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # definition of tags that give a structure to a document
 #
-# $Id: structuretags.pm,v 1.153 2003/03/05 16:25:57 sakharuk Exp $
+# $Id: structuretags.pm,v 1.156 2003/03/14 23:23:45 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -241,6 +241,7 @@ ENDCHECKOUT
 sub start_problem {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
 
+  $Apache::lonhomework::parsing_a_problem=1;
   # meta is called from lonpublisher, which doesn't uses the normal
   # lonhomework method of parsing the file which means that inputtags 
   # won't get reset
@@ -253,6 +254,7 @@ sub start_problem {
   $Apache::inputtags::part='0';
   @Apache::inputtags::responselist = ();
   @Apache::inputtags::previous=();
+  @Apache::inputtags::previous_version=();
   $Apache::structuretags::printanswer='No';
   if ($target ne 'analyze') {
     &initialize_storage();
@@ -476,6 +478,12 @@ sub end_problem {
     &Apache::lonxml::debug("in end_problem with $target, edit");
     $result = &problem_edit_footer();
   }
+
+  undef(%Apache::lonhomework::history);
+  undef(%Apache::lonhomework::results);
+  undef($Apache::inputtags::part);
+  undef($Apache::lonhomework::parsing_a_problem);
+
   return $result;
 }
 
@@ -679,6 +687,7 @@ sub start_part {
   $Apache::inputtags::part=$id;
   @Apache::inputtags::responselist = ();
   @Apache::inputtags::previous=();
+  @Apache::inputtags::previous_version=();
   my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
 
   if ($target eq 'meta') {
@@ -742,6 +751,7 @@ sub end_part {
     $result=$gradestatus;
   }
   pop @Apache::inputtags::status;
+  $Apache::inputtags::part='';
   return $result;
 }