Simple Lightbox not working after changing home url to alias name

Hello,

I have changed my home url in WP general settings (wp-url and website-url) to an alias name, e.g. 1.2.3.4/wordpress to beautifulname/wordpress. Afterwards I have done an URL Rewrite so the links of the media have the new url as well.

But now Simple Lightbox isn’t not working anymore ??
When I click on an image, it’s just opened like without the plugin. I can’t imagine that it has something to do with server settings etc., because it is the same server – just another alias name.

I already tried to delete/reinstall the plugin. I reimported content but nothing happened.
My media files aren’t inside of WP’s mediathek, I upload them via sftp into wp-uploads – if this is important.

Does someone know the reason and the solution how to get Simple History to work?

Thanks for any help you can offer.
saNNNy