Hi,
When I create an Item edit form menu item, the front edit form opens to new window, as it's supposed to.
But when I link a text, image, etc to this menu item, I face a problem: the front edit form opens to the same window without navigation.
How can i solve it?

Thanks

Hello,
Check under your browser's developer tools' console tab for any JS errors.
This behaviour indicates a JS error.

Krikor wrote: Hello,
Check under your browser's developer tools' console tab for any JS errors.
This behaviour indicates a JS error.

Hi Krikor,
I get the following errors

Uncaught TypeError: Cannot read property '0' of null
at constructor.top (main.js:1)
at new constructor (main.js:1)
at main.js:1
at HTMLDocument.t (main.js:1)

Any solution? Thanks!

This means that your template (I am assuming since K2 has no main.js file) is producing this JS error.
This error will break most of the JS functionality, not just K2.
You need to address this issue to the template's developer.