Prices not including tax after upgrade to Business

Hi,

I set up Hikashop using the free version, but then needed the order number option, so I purchased and upgraded to the Business version. However, now the fronted is not showing prices including tax (VAT), and it was working before the upgrade. I tried showing both prices, exclusive and inclusive, on the fronted and it seems it is not adding tax to the product prices now.

How to fix it?

EDIT: Problem solved. I uploaded csv for products with new quantities and it cleared the tax categories. I'm not sure why that happened, but at least I know the problem now.