Quote Originally Posted by paulm View Post
adding the missing file (\includes\init_includes\init_zen_group.php) actually should fix the issue without any file modification (on Zen Cart 1.3.x versions).
Quote Originally Posted by paulm View Post
Then I don't understand why adding the file doesn't fix it.
Files in the /includes/init_includes folder are not auto-loaded. Thus, unless you have something configured to load that file, its existence will not make any difference.