Nothing with JavaScript is working?

Hi, everyone.

I’ve been looking for an answer to my problem without success.

I think I’m having problems with something related to javascript.

Here are the signs/symptoms the site is experiencing:

1. Content toggle plugins are not toggling content.
2. Responsive menu is not showing up (since it is JS based).
3. Contact form 7 needs to refresh the page to display errors or to send a message (usually, contact form 7 updates the content within it’s “div” without refreshing the page).
4. In the backend, my theme dashboard doesn’t do anything when I hit the “save settings” button (usually, my theme displays an animated circle beside the “save settings” button when I click it)

What I’ve done so far:
1. Reinstall latest wordpress version.
2. Switch to default wordpress theme.
3. Disable all plugins.

Nothing have worked.

Other wordpress installations within the same hosting are working fine, so I think it is nothing related to the hosting.

Don’t know what to do.

Can anyone please give me a pointer?

Thanks in advance.