After a lot of frustration with WP ecommerce, I decided to try to find something else.
And there was Marketpress.. When I saw that there was a possibility to import all products from Wp Ecommerce, I bought the plugin.
First I installed it on a test site ( http://easyandquick.net) Almost everything is working... the pagination is still not working. After that I tried to put it on our website http://ellad2.com After installation it was not possible to reach the checkout page. With two or three items in the shopping cart I tried to checkout. But it was all the time returning to the home page.
All I want is a site who is working good and stable