--- loncom/xml/run.pm	2005/11/15 20:50:26	1.54
+++ loncom/xml/run.pm	2006/02/20 23:52:20	1.57
@@ -1,6 +1,6 @@
 package Apache::run;
 #
-# $Id: run.pm,v 1.54 2005/11/15 20:50:26 albertel Exp $
+# $Id: run.pm,v 1.57 2006/02/20 23:52:20 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -50,6 +50,7 @@ while (!$_LONCAPA_INTERNAL_oldexpression
 		 my $__LC__prefix;
 		 my $__LC__result;
 		 while (1) {
+		     if ($__LC__a =~ m-^&(theta|pi|rho)$-) { last; }
 		     { 
 			 use strict;
 			 no strict "vars";
@@ -139,8 +140,10 @@ sub run {
 	if ($innererror=~/line (\d+)/) {
 	    my $linenumber=$1;
 	    my @code=split("\n",$code);
-	    $code[$linenumber-1]='<b><font color="red">'.
-		$code[$linenumber-1].'</font></b>';
+	    if ($linenumber < scalar(@code)) {
+		$code[$linenumber-1]='<b><font color="red">'.
+		    $code[$linenumber-1].'</font></b>';
+	    }
 	    $code=join("\n",@code);
 	}
 	&Apache::lonxml::error($errormsg.$code.'</pre>');