Add link gone from main menu and getting errors when trying to add new menu item
Ok, found the answer, eventually another error popped up when trying usermenu:

Warning: Illegal string offset '#value' in 
content_menu_form_menu_item_delete_form_alter() (line 270 of 
C:\aquiasites\redoII\sites\all\modules\content_menu
\content_menu.module)


I disabled all possible menu plugins...the offending module didn't create any errors on main menu and other, ONLY on usermenu...

Disabled this module https://www.drupal.org/project/content_menu 

Now works fine