An update, after some preliminary inspection of EO's zip-file distribution:
If you are performing a fresh install of EO 4.3.5 on Zen Cart 1.5.6+, be sure to use the as-supplied zc156+ version of /includes/classes/order.php -- i.e. do not copy the version distributed by EO! The zc156+ version of that class-file contains the changes required by EO and using the EO-supplied version could result in unpredictable processing for zc156+.
I'll be checking more later this week.
Note: The same applies to the /admin/orders.php distributed by Edit Orders. The notifications required are "baked into" zc156, so use the zc156-supplied file in preference to the one shipped by EO.
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