Black Sliders after update

Hi @guirto!

The problem happens because of a JavaScript error which is related to your Easy Media Gallery Pro plugin that uses MooTools library in this file:
wp-content/plugins/easy-media-gallery-pro/includes/js/mootools/mootools-core-1.4.5-min.js

The main problem with MooTools is, that it is outdated, it wasn’t really developed for 5 years now. As I can see the plugin is using 1.4.5 version which was released in 2012:
https://mootools.net/blog
So, it’s very old.

So the main problem with MooTools is that it’s outdated, and it shouldn’t even be used by developers, as you see this discussion too:
https://github.com/mootools/mootools-core/issues/2798
just people used it a lot back in the days and now that it isn’t maintained properly anymore, they are still using it.

I’m not 100% sure about why this problem just started appearing after the update but we are aware of problems with MooTools which happen because MooTools overwrites (or removes) native JavaScript codes and I suspect that is the case now as well. In version 3.3 we used JQuery on the frontend, but since 3.5 we use native JavaScript only (it’s much better in terms of speed), so there’s a good chance that the issue happens because MooTools is modifying native JavaScript codes.

First I recommend disabling this Easy Media Gallery Pro plugin to verify that it causes your error. This should prevent the error from happening, and the slider should be fine.

If all will be well with Easy Media Gallery Pro plugin disabled, I recommend contacting the developers of this Easy Media Gallery Pro plugin to learn the best solution to get this solved. Maybe they’re working on a new version that doesn’t use MooTools anymore.

Hi @guirto

Great, I’m glad I could help figuring it out!

I’ll go ahead and mark this topic as resolved.