Ever since upgrading to 1.3.8 I have what seems to be a unique problem... when someone adds an item to their cart, and they are from Maryland, it charges them state tax just like it should... just like I have it setup. BUT if they add ANOTHER item to their cart, the tax doesn't change. It only ever taxes the first item...

I've double checked all the tax setup info to be sure nothing was shifted after the upgrade but it all looks the same... I've gone through the check list... I've made sure they are all "taxable goods" items... I've deleted my MD setup for zones and rates and redid them... nothing seems to fix it!

In short, add a $10 item to cart and it charges 60 cents... then add another 1,2-200 items and the tax never changes.

Any thoughts?