Hello, thank you for such a quick response.
In my game website k2 is used for reviews and flexicontent for news that are of various platforms.
I have migrated both components from version joomla 1.5 to 3.3.6 and from the part of administration looks all right, everything works well.
The template I use currently supports k2, so I want to keep this component only for reviews.
Because my site not working correctly showing k2 category item menu, i decide to create a test site with demo content with the latest versions of both components and joomla 3.3.6.
I followed these steps to find the problem:
1 - Install joomla with demo content.
2 - Install k2 and import content.
3 - Create a menu type k2 category (Blog).
At this point if you access the menu looks good, but if you install flexicontent and publish the plugin, the items disappear.
Flexiplugins diabled.
Flexiplugins enabled.
Thanks a lot for support.