--- loncom/interface/lonhelp.pm	2022/05/29 20:48:57	1.48
+++ loncom/interface/lonhelp.pm	2023/04/06 17:36:12	1.49
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonhelp.pm,v 1.48 2022/05/29 20:48:57 raeburn Exp $
+# $Id: lonhelp.pm,v 1.49 2023/04/06 17:36:12 raeburn Exp $
 #
 # .tex help system web server handler
 #
@@ -254,8 +254,10 @@ sub handler {
                       };
      }
      my $firstfile;
+     $env{'form.texengine'} = 'tth';
      my $start_page=
 	 &Apache::loncommon::start_page('LON-CAPA Help',undef,$starthash);
+     delete($env{'form.texengine'});
      my $text='';
      my $uri = $r->uri;
      if ($env{'form.searchterm'}=~/\w/) {