Quote Originally Posted by Gadgit View Post
...
Also in edit_orders_functions.php around line 747 in eo_update_order_subtotal()

I have wrapped the $shown_price calculation in a check for whether prices are displayed with tax, and removed the tax calculation accordingly ...
Found some other potential issues related to the tax calculations. As a temporary work around (until I can dig into the needed changes more extensively) you will also want to make sure DISPLAY_PRICE_WITH_TAX and DISPLAY_PRICE_WITH_TAX_ADMIN are both set to the same value ('True' or 'False').