yes

dazzlingstocks DOT com / demo /ad...

demo/demo

Your category and items should have the customer access level and not registered.
Your user group should have the same access level in order to see the correct items.

under k2 user or joomla core user group

bez in k2 user group there no change access level option

To achieve the correct access view when your users login you need to use Joomla! User groups and not K2's. Also you need to have different access levels for each category and therefore per user.

Yiota Ziaggou wrote: Note that when I say 2 User Groups I do NOT mean K2 user groups.