After updating K2 from 2.6.0 to 2.6.1 i have lost most of the components that i have installed.
components that have been lost are working but i am unable to access them from the component's list.

anyone facing the same problem ;

Hi. K2 does not interfere with other extensions. Proabably there is a javascript conflict that it breaking your menu. Ensure that you have setup correctly K2 jQuery handling options under K2 parameters.

After hours of checking what happens, i realized that the problem appears after updating jce editor on its latest version (2.2.8.2) !