please go to your FTP server, create php file with phpinfo() function inside and send us link to that file so we can have a look on your server settings. The problem is probably related to limits but to be sure which one is the reason, we need that link. For more details about file creation, please visit https://mediatemple.net/community/products/dv/204643880/how-can-i-create-a-phpinfo.php-page
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I would restore a revision but i have realised now that the theme doesn't support them.