Index: /branches/release-39/lib/MT/Blog.pm
===================================================================
--- /branches/release-39/lib/MT/Blog.pm (revision 2351)
+++ /branches/release-39/lib/MT/Blog.pm (revision 2476)
@@ -284,4 +284,7 @@
     }
 
+    $blog->custom_dynamic_templates('none');
+    $blog->save;
+
     MT->run_callbacks(
         ref($blog). '::post_create_default_templates',