I have a very strange problem with this plugin. For most pages, the plugin works. I see a meta box with the images that are attached to the post.
For some pages though, the metabox does not show up. I do have pictures attached to the page, but there's no metabox showing them on the edit screen of the page.
I already checked the screen options, there's no "Gallery Images" option on the pages where I don't find any Gallery meta box. On other pages, the option is available.
I hope someone can tell me how to fix this.