I believe the two fixes posted in
http://www.zen-cart.com/forum/showthread.php?p=371348 (for group discounts)
and
http://www.zen-cart.com/forum/showthread.php?p=366574 (for coupons)
are solid and should be incorporated into 1.3.8.
I believe that the defined constant COMPUTE_TAX_ON_POST_DISCOUNT_PRICE which is separately defined in each of these classes should be put in the Admin in Configuration->My Store so that they would only have to be defined once and could be reused by other discounting modules.
Thanks,
That Software Guy
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