Hi,

setpreferredcurrency.php

-) clear browser cache, delete all cookies.
-) load a page with a currency list in a select box and change it from one currency to another. Then after the currency change you won't be redirected to the current page.

Reason:

eZRedirectManager::redirectTo

goes to

eZRedirectManager::redirectURI

LastAccessesURI and LastAccessedModifyingURI are empty

so the redirect manager redirects to /shop/setpreferredcurrency and this redirects to /shop/setpreferredcurrency and this redirects to /shop/setpreferredcurrency and this redirects to /shop/setpreferredcurrency

...

Best wishes,
Georg.