Prices shown without Tax despite the settings (hard to reproduce)

[Escuro]

Hi!

 

I have encountered a strange bug, which occurs quite rarely but is very annoying. And now I am even getting complaints from customers, which makes me sad!

 

Ok, for the bug -

1. Customer visits any page with from a link (i.e. Facebook post or Google result)
2. The store is configured to always show tax, everywhere tax is enabled. No option to buy without tax
3. However, customer on the landing page will see ALL the items without tax.
4. It is the same for 0-3 page clicks and tax is added after a page reload, than it goes away.

Please help me find the problem!

 

EDIT PS version 1.6.1.9, Cache is disabled(otherwise we use APC), all taxes are set for all possible countries.

Edited November 24, 2016 by Escuro (see edit history)

[Escuro]

Update: Found that PS does not actually set VAT to all enabled countries by default, added those to the tax rules manually. However, I don't think this is the issue