You could try turning on the autoload debug. Edit /includes/application_top.php and change
Code:
/**
* boolean if true the autoloader scripts will be parsed and their output shown. For debugging purposes only.
*/
define('DEBUG_AUTOLOAD', false);
to
Code:
/**
* boolean if true the autoloader scripts will be parsed and their output shown. For debugging purposes only.
*/
define('DEBUG_AUTOLOAD', true);
and then refresh the page. That will result in the Zen Cart startup initialization sequence being output to the screen so that you can see where it's looping. Be sure to change it back to false once you're finished!
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