When I try to hide or show menu options from the main category it is not working. I have to go to the item options menu, and then set the hide or show options before it works. What am I doing wrong?

Hi. Please make sure that:
1. You are messing with the correct parameters. If you are viewing one category the parameters are on the category edit page. If you are viewing more the parameters are on the menu item page.
2. You have cleaned Joomla! cache after your changes.
3. You are using the latest version with the default K2 templates.