Hello!
I've been using K2 (v.2.5.7, Joomla 2.5.4) for several month and everything was ok. But for some reasons, which I can't figure out, it began to generate incorrect URLs for categories in Joomla menu. For example, I create new menu item in my Main Menu, choose menu type "K2 category" and link it to some K2 category, it creates URL as following:
http:/site.ru/index.php?option=com_k2&view=itemlist&layout=category&task=&id=&Itemid=112
but correct one should be:
http:/site.ru/index.php?option=com_k2&view=itemlist&layout=category&task=category&id=23&Itemid=112
So, ID parameters are missing in URL. Why is it happens? It's a serious problem for me, because I can't create any new categories in menu.
Please, your urgent help is needed, site is already in production.
Thanks

The same problem was posted before on the forum with no clear solution:
getk2.org/community/New-to-K2-Ask-here-first/146444-K2-Content-Category-view-displaying-within-template-though-items-dox-not-show-in-the-template#146452
getk2.org/community/New-to-K2-Ask-here-first/144106-K2--SH404sef--Joomfish--missing-itemid#144107
Could someone from the developers help?
Does anyone have suggestions why "task" and "id" parameters are missing in the menu URL?
Thanks!

Check your page for javascript errors when you create menu links. Also try to update Joomla!. Version 2.5.4 is outdated. The current latest stable Joomla! version is 2.5.6

I updated Joomla to 2.5.6 but the problem didn't go away :( No Javascript errors. Could you suggest something more twhat can be the reason?

Clean your browser's cache and try again.

[SOLVED]
It was plugin Soccomments which created such a problem. After swiching off everything began to work fine.