Something "bad" might be happening before the logging is established by the Zen Cart base code.
You can edit /YOUR_ADMIN/includes/application_top.php, towards the top of the file, changing the line that reads
Code:
if (!defined('DEBUG_AUTOLOAD')) define('DEBUG_AUTOLOAD', false);
to
Code:
if (!defined('DEBUG_AUTOLOAD')) define('DEBUG_AUTOLOAD', true);
define ('STRICT_ERROR_REPORTING', true);
and then refresh the browser. That will result in messages being displayed to the screen as your admin page loads and "should" show where the progress stops (that's where the issue is).
Just remember that you'll need to restore these changes.
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