It was a custom file of various code. The piece that caused the problem was this filter tiny_mce_plugins missing its function which I included.

add_filter( 'tiny_mce_plugins', 'disable_emojicons_tinymce' );
function disable_emojicons_tinymce( $plugins ) {
  if ( is_array( $plugins ) ) {
    return array_diff( $plugins, array( 'wpemoji' ) );
  } else {
    return array();
  }
}

I’ve disabled all plugins, that hasn’t seemed to bring the link / hyperlink button back in the Text Area element.

This solution doesn’t seem to be what I’m looking for. I don’t want the lightbox to only have a single image. I would like it to show everything in the section that’s selected (Either all Dogs or all Cats). I think most people would say intuitively that this is how it should work. In the example above, when “All” is selected, all four animals can be viewed in the lightbox (which is great), but when one of the items is selected and filtered, such as “Dog”, then the two dogs should be shown in the lightbox, but none of the cats should be shown.

The referenced link does talk about adding custom html to a codeblock but this is out of the question for my client who’s not very tech-savvy and has almost 200 images in five categories. Easy management is why we’re using this theme.

I can look for other solutions but I believe that the functionality here should work the way that I’m describing it. I can’t imaging that other developers are okay with a Portfolio Category being selected and then the lightbox shows images from other categories. If this is how it works and not something that I’m doing wrong, then I hope that you will consider changing / fixing this functionality in a future update.

Thanks.