Hi,
Sorry for the trouble. It is caused by the WP6.6 update.
– Please try to re-download(from themeforest) and re-install ART theme and BM content builder plugin
– Pease try to purge the cache if there is a cache plugin on your WordPress also.
====
If it doesn’t work, May I check your website? Because I need to check the live website, it is a faster way to solve issue normally.
If you permit, please leave your wp-admin access (URL / username/password) to via picking up ‘Set as private reply’.
Regards!
SeaTheme – FAQs – WordPress Customization – Facebook