Hi there,
I see that you activated another theme too (as I checked it) and your site is already slow, took sometimes for me to load your site which uses the different theme. Hence, there could be multiple issues with your hosting and it’s affecting your site’s performance, and if the site is slow, the builder will not load. Perhaps you can disable your hosting’s security while we’re testing? Re-installing Pro theme will also re-install the deleted files due to host security which will make it work for a while.
I also checked and there is another issue Failed to load resource: net::ERR_CONTENT_LENGTH_MISMATCH
and it appears when the browser loads the stylesheet files. I recommend trying a different host, are you on shared hosting? If so, you can’t increase its memory limit or disable the security.
Thanks!