Hello. Thank you for contacting the Toolset support.
Can you please share admin access details so that I can review the error and once I review your setup I will try to reproduce the issue on my end and update you.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.
I see there is JS error coming from the plugin "PayPal WP Button Manager" - would you mind to deactivate for a moment and then try to set the background image for your container block and see if you succeed.