Added this plugin into a fresh wp install and now it works. Probably interfered with some other plugin.
Thanks for answer Lampelina!
Im using a plugin called User Submitted Posts. So the users can upload images.
Right now it’s a textfield to type in tags for the usersubmitted post, but im trying to implement checkboxes instead.
If anyone know a better plugin for users to submit posts with featured images that would also be great.
