@webcraftic
Any page that contains either an [insert_php] or a snippet reference. Not all php would fail the page, but for example this: WC()->cart->empty_cart(); inevitably leads to an error 500 after Update of the page (not the snippet – I can change code in the snippet and update and everything is ok, then change some text in the page that uses this snippet, update and – voila – error 500).
Have the same, but instead of disabling the plugin I just edit, update, get the error 500, hit Back button and everything’s working fine! Note – I am using the latest version of the plugin.