Next version will be released this week.
The solution was easy. I edited the file listing of the view category via the menu Display->Views and change the line:
$title = 'show_page_title';
to:
if(version_compare(JVERSION,'1.6','<')){
$title = 'show_page_title';
}else{
$title = 'menu_text';
}
By default, when the cart is empty and that you click on the cart link, it redirects you to the listing of products of the main category. If you want it to go somewhere else, you can just enter the URL in the option "URL where to redirect when the cart is empty" in the tab Checkout of the config.
I didn't notice that your website was slow.