Image upload field won't show I have added a image field with upload widget to my content type. It is shown when I try to add content as administrator, but not with other user types. Any ideas what may be wrong? Probably some permission or something, but I am simply unable to find out which setting this may be. Any help?

Seems like the fields are visible if I disable the "OG Field access" module. But when I enable it again, I cannot see the fields.
If it's a permissions problem you should go to the People tab at the top of your nav bar. Then under People click on "Permissions" and see if you can find the permissions for the image field and give other users permission there.