Thanks for the detailed reply.
1/ Do you use our Built-in Email Builder? Try to disable it and check then.
2/ Your site is under maintenance mode, so we can’t check it. Please provide temporary wp-admin access.
Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.