--- loncom/homework/caparesponse/caparesponse.pm	2011/02/02 18:48:06	1.245
+++ loncom/homework/caparesponse/caparesponse.pm	2011/06/08 01:39:32	1.247
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # caparesponse definition
 #
-# $Id: caparesponse.pm,v 1.245 2011/02/02 18:48:06 raeburn Exp $
+# $Id: caparesponse.pm,v 1.247 2011/06/08 01:39:32 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -402,7 +402,7 @@ sub setup_capa_response {
 
 sub check_submission {
     my ($response,$partid,$id,$tag,$parstack,$safeeval,$ignore_sig)=@_;
-    my @args = ('type','tol','sig','format','unit','calc','samples');
+    my @args = ('type','tol','sig','format','unit','calc','samples','preprocess');
     my $args_ref = &setup_capa_args($safeeval,$parstack,\@args,$response);
 
     my $hideunit=
@@ -1136,6 +1136,7 @@ sub start_stringresponse {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result;
     my $id = &Apache::response::start_response($parstack,$safeeval);
+    undef(%answer);
     if ($target eq 'meta') {
 	$result=&Apache::response::meta_package_write('stringresponse');
     } elsif ($target eq 'edit') {