Hello @juliana,
Thank you for the very detailed post information. I have checked your site and there is a JS error on the site which is why the builder is not loading. This is because you have added an incorrect JS code in Pro > Theme Options > JS section. Be advised that the provided JS section in the Theme Option can only accept JS code. It will result to an issue if you insert HTML tags like <script> or <div> tags. You have inserted this code which created the JS error:
<div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = 'https://connect.facebook.net/pt_PT/sdk.js#xfbml=1&version=v2.12&appId=194614867796159&autoLogAppEvents=1';
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
<!-- MailerLite Universal -->
<script>
(function(m,a,i,l,e,r){ m['MailerLiteObject']=e;function f(){
var c={ a:arguments,q:[]};var r=this.push(c);return "number"!=typeof r?r:f.bind(c.q);}
f.q=f.q||[];m[e]=m[e]||f.bind(f.q);m[e].q=m[e].q||f.q;r=a.createElement(i);
var _=a.getElementsByTagName(i)[0];r.async=1;r.src=l+'?v'+(~~(new Date().getTime()/1000000));
_.parentNode.insertBefore(r,_);})(window, document, 'script', 'https://static.mailerlite.com/js/universal.js', 'ml');
var ml_account = ml('accounts', '2113190', 'f8j0o0u3n7', 'load');
</script>
<!-- End MailerLite Universal -->
<div id="fb-root"></div>
<script async defer crossorigin="anonymous" src="https://connect.facebook.net/pt_PT/sdk.js#xfbml=1&version=v8.0&appId=194614867796159&autoLogAppEvents=1" nonce="DmDNL2Dx"></script>
<script src="https://apis.google.com/js/platform.js"></script>
Please remove this code. You will have to install “Insert Headers and Footers” plugin instead. The plugin will give you a way to integrate your JS code into your site seamlessly.
Best Regards.
