I'm seeing issues with tax not being correctly calculated on the checkout page at load time. For example if I checkout with a product priced at $20 with UK VAT (17.5%) applied I'm quoted VAT of $1.75! However if I proceed to pay the VAT is then correctly calculated on the receipt page.
I've tried switching back from my custom checkout template to the standard FoxyCart template but the problem still persists. Any ideas?