I have fixed it:

class-mpp-admin-settings-page.php line 625:

Was if (typeof(localStorage) !== 'undefined') {

Now if (typeof(localStorage) !== 'null') {

Now I can get back to understanding why MediaPress is not loading the right size photo, or the photo.php template file.

Ok, learning every day 🙂

It seems that having an ampersand printed as # 0038 ; is expected behaviour, and that it is some js, that is not recognising that expected expression that is failing. it is an html decode issue.

Yes, this is not Mediapress, Mediapress is affected because the js for the settings reveal is looking for an & in the link string, and can’t find it. but the same thing seems to be happening to all the backend pages. I’ll wait till later tonight and do another plugin deactivation session. It has to be a plugin somewhere.

That was my bad, it turns out.

Things are going from bad to worse. I now have a situation where the js fails only on the MPP settings page. But, the failures seem to be due to WordPress deciding that all & symbols on the page need to be swapped to & currently this in only happening on the MPP settings page, but I had to deactivate a news-ticker plugin that was doing the same thing.

I’m not stressing, though, the front end is still working as it was. It is missing the zoom, but, it’s loading the wrong image and there is nothing to zoom.

I did deactivate all plugins, and nothing changed..

I modified the plugin template for shortcode/grod-photo.php

/**
 *
 * Photo list in shortcode grid view
 * You can override it in yourtheme/mediapress/default/shortcodes/grid-photo.php
 *
 */
$query            = mpp_shortcode_get_media_data( 'query' );
$lightbox_enabled = ! empty( $atts['lightbox'] ) ? 1 : 0;
$lightbox_class   = $lightbox_enabled ? 'mpp-shortcode-lightbox-enabled' : 'zoooom';
$media_ids        = join( ',', $query->get_ids() );

This adds my zoom function to the gallery grid view, but if I enable the lightbox, and get nothing, just the attachment page, no lightbox, no description.