If you use automatic update of the currency rates in your prestashop - i've got bad news - it isn't working now! 

" There is a problem with the PrestaShop currency conversion. I manually updated my currienes and then notices 'later' that except for a few currencies GBP/AUD/CAD the conversion rate was set to zero. so in other words all my products except for EUR and those mentioned has a displayed price of 0.00. Can someone else verify that there conversion is or is not working. I saw a post earlier today 'cant find it now' where someone was having a similar problem. "

We found issue - file with exchange rates from prestashop api haven't got all rates for currencies:  http://api.prestashop.com/xml/currencies.xml