Quote Originally Posted by DrByte View Post
"internal server error" is a generic "something went wrong, but we can't display it to the screen for security reasons".
So, look in the /logs/ folder for myDebug-xxxxxxxxx.log files that are generated when the error occurs.
If it's not recorded there, then you might have to ask your hosting company for access to the Apache and/or PHP error logs.
See: http://www.zen-cart.com/content.php?124
All I could find what this
httpdocs/includes/classes/db/mysql/query_factory.php on line 155

Line 155 trigger_error($this->error_number . ':' . $this->error_text . ' :: ' . $this->zf_sql . $query_factory_caller, E_USER_ERROR);

But I do not this this is it.