created own language file, switched whole site to that language. after pressing button "Buy" and others too, before redirecting getting white page with text:
"Warning: Cannot modify header information - headers already sent by (output started at /home/xxx/shop/components/com_jshopping/lang/fi-FI.php:1) in.....link to file depending what you click like : shop/components/com_jshopping/lib/functions.php on line 348
Joomla: 1.6.1
JoomShopping: 3.0.0
JoomShopping: 3.0.0