--- loncom/xml/lonxml.pm	2016/08/05 20:57:58	1.531.2.20
+++ loncom/xml/lonxml.pm	2016/08/09 23:49:16	1.531.2.21
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # XML Parser Module 
 #
-# $Id: lonxml.pm,v 1.531.2.20 2016/08/05 20:57:58 raeburn Exp $
+# $Id: lonxml.pm,v 1.531.2.21 2016/08/09 23:49:16 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -440,9 +440,9 @@ sub latex_special_symbols {
     } else {
 	$string=~s/\\/\\ensuremath{\\backslash}/g;
 	$string=~s/\\\%|\%/\\\%/g;
-	$string=~s/\\{|{/\\{/g;
+	$string=~s/\\\{|{/\\{/g;
 	$string=~s/\\}|}/\\}/g;
-	$string=~s/\\ensuremath\\{\\backslash\\}/\\ensuremath{\\backslash}/g;
+	$string=~s/\\ensuremath\\\{\\backslash\\}/\\ensuremath{\\backslash}/g;
 	$string=~s/\\\$|\$/\\\$/g;
 	$string=~s/\\\_|\_/\\\_/g;
         $string=~s/([^\\]|^)(\~|\^)/$1\\$2\\strut /g;