Hi,

I'm working on Kiji template and have one issue. When I edit K2 item on front end I can save item with Save button, but when I want to close editor by clicking on Close button nothing happens. Am I missing something here?

Turns out there is a conflict between MooTools (which is used for the modal) and the masonry script which is used in a K2 Content module.

I have patched the template's js file.
Unzip this file and paste it over the file located at templates/kiji/js/behaviour.js

Thank you. That's did the trick.

One more question... Is it possible to use in main menu two, three or four menu items columns in drop-down? Something as on attached picture. Or should I use some third-party extension to achieve this?

These are actually tabs.
Why don't you take a look at:
www.joomlaworks.net/extensions/free/tabs-sliders-for-articles-plugin