I have installed the Media Gallery module for someone's site to upload fotoalbums with; it's need to add a file size restriction because quite a bit of pictures are coming in.
I can't tell what the exact error is in English; the site's language is Dutch. When I want to edit fields in my Media Gallery content type, I get a message that says the settings are stored in the database, locked and I can't change those settings anymore.
Update: There is a similar issue at Drupal.org; it looks like it isn't possible. Or is it?