--- loncom/xml/londefdef.pm	2016/08/13 20:01:52	1.456.2.2
+++ loncom/xml/londefdef.pm	2020/09/10 00:33:39	1.456.2.5
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Tags Default Definition Module 
 #
-# $Id: londefdef.pm,v 1.456.2.2 2016/08/13 20:01:52 raeburn Exp $
+# $Id: londefdef.pm,v 1.456.2.5 2020/09/10 00:33:39 raeburn Exp $
 # 
 #
 # Copyright Michigan State University Board of Trustees
@@ -92,6 +92,14 @@ sub start_m {
     my $inside = &Apache::lonxml::get_all_text_unbalanced("/m",$parser);
     if ($target eq 'web' || $target eq 'analyze') {
 	&Apache::lonxml::debug("M is starting with:$inside:");
+        if (!($inside =~ /^\s*\$.*\$\s*$/ || $inside =~ /^\s*\\[([].*\\[)\]]\s*$/)) {
+            # Non-math LaTeX will not be rendered correctly with MathJax
+            # and it should be avoided anyway.
+            # On top of that, MathJax will render math without $, but
+            # it will fail with tth. This is worth a warning.
+            # (even though some people might just use latex for printing)
+            &Apache::lonxml::warning(&mt('Missing $ in [_1].','<m>'));
+        }
 	my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
 	if ($eval eq 'on') {
 	    $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
@@ -812,7 +820,7 @@ sub end_h1 {
 	$currentstring .= $token->[2];
     } elsif ($target eq 'tex') {
 	my $post='\vskip 0 mm ';
-	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	my $align=lc(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1));
 	if ($align eq 'center') {
 	    $post='\end{center}';
 	} elsif ($align eq 'left') {