Category display not possible, 404 error page why?

I have link to my shop as linktype: HikaShop » category, there is also a menu with category tree, there are some problems:

1. if i click on category i get 404
2. if i enable mijosef, i get evrything in german, but not in other non-default languages
3. why i get only 404 if i use only hikashop and joomla-sef

Nothing is unpublished or deleted....

Hi,

Turn off the "Force canonical URLs on listings" option there and that will hopefully solve the problem which probably comes from a wrong canonial URL entered in your categories.