Hi,
Please try to update both Arnold theme and BM content builder plugin to check if it works, how to update: https://doc.seatheme.net/theme/arnold/install-arnold/installing-arnold-theme-via-wordpress/#manual-update
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If it doesn’t work, please paste your question and wp-admin(URL / username/password) with picking up “Set as private reply”, I’ll log in to check it.
(If there is the Jetpack plugin, please disable “Allow users to log in to this site using WordPress(.)com accounts”)
Regards!
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