Brief
We have fixed a quantity prices problem in two 'includes' and multiple blocks.
Description
"Apply user/group discount to the price" setting in Quantity Prices does not apply to product quantity price until you select some qty or option.
Solution
Download the global fix for this problem with many files in one archive:
http://www.viart.com/downloads/quantity_discount_fix-4.zip
Further, extract files from 'blocks' folder into 'blocks' folder of your shop and files from 'includes' folder into 'includes' folder via FTP in BINARY mode replacing existing files. Please do not forget to make a backup copy of the current files in case something goes wrong.