I was in a situation that all images in a album were [b]non-Visible[/b]. Then even I set the album to [b]Publish[/b], no images displayed in the album. I was suggested by developer to log into [b]Admin > overview > Publish content[/b] to select every image one by one and then apply [b]Visible[/b].
If I had many images in the album, it would not be handy job.
If there was a function for me to select the album and change all images inside to [b]Visible[/b], it would be great.