I use the K2 Content Module many instances on our site www.ieterna.org and it is working fine. However, when I try to modify the articles selected for display, all the options to choose content items have disappeared. I cannot modify/add/delete content items because these options have disappeared from the module admin display. I am using J 3.3.3 and K2 2.6.9 (recently updated).
i.imgur.com/yixiCyZ.jpg

Hello,

Which version where you using prior to the update?
Are new K2 Content modules showing the same behaviour?