Price inc & ex not displayed when address changed

[future1]

Hello everybody.

 

I have a bug on a test site that has consumed many hours over many months and is still causing a problem. The site is configured to show prices with and without tax, using the following in classes\currencies.php

 

function display_price($products_price, $products_tax, $quantity = 1) {

 

$return_this= $this->format($products_price * $quantity) . ' ex VAT <br/> '. $this->format(tep_add_tax($products_price, $products_tax) * $quantity) . ' inc VAT <br/> ' ;

return $return_this;

 

 

Everything works perfectly until I amend the primary address of a logged in user, then (until the user logs out) the including and excluding price displayed as the same.

 

I have checked through all mu code and tried numerous changes and its stil the same.

 

Any ideas?