the MailBeez V2.6 installation says to place
to enable tracking of open/click/order.
That causes an error!
When clicking on a link in an email you will get a white page. The click is not tracked
do not place the file mentioned above (or remove it)
// MailBeez Click and Order tracker require(DIR_FS_CATALOG . 'mailhive/includes/clicktracker.php');
at the bottom of
Background: when loading the extra_configures the zencart system is not initiated (e.g. constants are not loaded), which breaks the mailbeez_tracker.