Hi Patrice, got exactly the same problem. No idea when or why the products disappear from the order, leaving only the total amount details...
In addition to that the customer gets no notification of the update or the comments added to the last update. When I send a notification about the update from orders.php it's all ok and gets the green tick. Anyone knows where the problem is?
Another little issue: Fixed the "no tax calculated thing" but sometimes I got 2 tax rates showing up and then the order total display is mixed up. Any idea where I can search for this in the edit_orders.php?
BTW I'm using v1.75
abra