Doesn't work without Jetpack?

This plugin has nothing to do with Jetpack and of course it’s working without it as well.

Except it isn’t. Whenever I disable Jetpack, this plugin stops working. My blog is arbitrarynonsense.com, in case you want to look into this further. I can’t think why Jetpack should affect it.

In which particular page do you have a spoiler?

This one, on plot twists.

It works as expected in my browser, check out this screenshot. Which browser do you use?

Yes, it also works for me, but Jetpack is currently enabled. I can disable it now, if you like?

Yes, please.

Okay, it’s deactivated now.

Open the file:

/wp-content/plugins/fancy-spoiler/plugin.php

and change line 106 from:

wp_register_script('fancyspoiler', plugins_url(FS_PLUGIN_DIR_NAME . '/js/spoiler.min.js'), '', '', true);

to

wp_register_script('fancyspoiler', plugins_url(FS_PLUGIN_DIR_NAME . '/js/spoiler.min.js'));

and let me know if problem remains.

I’ve changed it, but the problem still remains.

Could i have access to your admin area? If yes, shoot me an email with credentials at kouratoras[at]gmail[dot]com

Alright, I’ve just sent you an email. Thanks for all your help so far. I appreciate it a lot.

Email replied.

Topic resolved, there was a conflict with your theme.

Yup. It was my theme’s fault, not the plugin’s.