Whenever I try to add a new item or category and save it, nothing ever shows up in the list. Yet for example if I create new item, previous categories I've created show up in a dropdown, but I still can't get anything to show up in the list of created items or categories.

I'm trying to use a module called SP tabs, and I need to be able to select categories from the list in that module.

Hi. Esnure that you are using latest versions of K2 and Joomla!. Try to clean your browser's cache.

I'm using K2 version 2.5.7 and Joomla version 2.5.6. Cleared the cache a bunch. Still not seeing anything at all.

Have you selected any language in the relevant drop down? Make sure that the language filter is set to "- select a language -".