Hello,
Take our apologies. We suppose that issue in not related to our theme but to your server settings. Try to increase SubstituteMaxLineLength Follow the instructions mentioned in this comment https://codecanyon.net/item/massive-addons-for-visual-composer/14429839/comments?filter=all&page=79#comment_18501820 Check the page editing after that.
Or provide us with WP Dashboard and FTP access to your site to check and help you.
Regards
