Thanks for you response, but no luck so far. This is what I have tried so far:
– Disabled all plugins
– Updated everything, WP 4.9.1, updated all plugins (still disabled)
– Uninstall / reinstall the plugin
I had a go at updating some settings and I am getting a few error messages:
Notice: Undefined index: enable_jquery in /home/******/public_html/dev/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 74
Notice: Undefined index: enable_prettyPhoto in /home/******/public_html/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 116
Notice: Undefined index: autoplay_slideshow in /home/******/public_html/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 119
Notice: Undefined index: hideflash in /home/******/public_html/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 129
Notice: Undefined index: modal in /home/******/public_html/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 132
Notice: Undefined index: deeplinking in /home/******/public_html/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 133
Notice: Undefined index: ie6_fallback in /home/******/public_html/wp-content/plugins/wp-video-lightbox/wpvl-settings.php on line 137
Agree that I need to test in a clean install of WP. That will take a bit longer. I will keep you posted.