[Plugin: Easy FancyBox] does not work at all

Hello,

I use the easy fancybox plugin on several of my blogs and never have had any problems with the plugin. I already have read the https://www.ads-software.com/plugins/easy-fancybox/other_notes/ section and checked potential conflicts or issues but could not solve the problem.

I tried to use another fancybox or lightbox plugin but there seems to be a general problem with my theme or my WordPress install.

I also tried to deactivate all other plugins in order to check if there is a conflict but even when only the fancybox plugin is activated the problem still exists.

Does anybody have an idea? You can find my blog on https://suedafrika-news.de and a gallery on https://suedafrika-news.de/suedafrika-bilder/kapstadt-von-oben/

Also interesting: If I browse to https://suedafrika-news.de/wp-content/plugins/easy-fancybox/fancybox/jquery.fancybox-1.3.5.js I get a 500 error message.

Thanks in advance!