Index: /branches/release-38/lib/MT/CMS/Template.pm
===================================================================
--- /branches/release-38/lib/MT/CMS/Template.pm (revision 2323)
+++ /branches/release-38/lib/MT/CMS/Template.pm (revision 2330)
@@ -869,5 +869,5 @@
 
     my $ctx = $preview_tmpl->context;
-    $preview_tmpl->var('preview_template', 1);
+    $ctx->var('preview_template', 1);
     my $html = $preview_tmpl->output;