Sorry to hear about the problem you are having.
Please try clearing the LiteSpeed Cache that you are using on your website.
Also, this can be due to plugin conflict on your site so please try temporarily deactivating all plugins except Unyson, Redux framework and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.
Thanks for the response. I’ve tried deactivating the plugins that are not part of the Jevelin theme but I still can’t WPBakery Page Builder to work.
I suspect the issue may be that the site currently has wpbakery 6.0.5 installed and I’m unable to update despite it being part of the Jevelin package. I’ve seen in another thread that there is a recommendation to delete the plugin and reinstall. Could this work? And if so, would deleting the plugin affect the pages that have been built using the plugin?
Would you mind if I log in to your site and do quick troubleshooting? If this is ok then could you please temporarily create an admin user account and share the account login details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able to see it)”?