Hi there,
@davingreen It’s not due to update, else, everyone should get 404 when accessing the builder. The 404 is different from 500, the 404 only means that you have permalink issue. To fix that, please go Admin > Settings > Permalinks
and save it (that action will flush the permalinks and assuming your builder’s base slug is /x/ saved in your cornerstone’s setting). This issue is very common regardless of theme or plugin and it happens if you create custom URLs, permalinks, post type’s rewrites and flushing the permalinks is the only solution.
@ponberries it can happen anytime even without updates especially for host’s that updates their system and environment. Updates could be done by anyone to anywhere but we’re not fully sure, so the only solution is to find the details of the said error. I’ll let you know if I find something.
Update: Are you on shared hosting? I see that you applied the memory limit to 256mb, but I installed a debug info plugin and it still not 256mb. That’s why I assumed it’s shared hosting since they usually don’t allow such changes. Second, your PHP version is still 5.4, Wordpress itself recommends 5.6 and above so please update that version too. New software comes along with new features which may not be applicable to the older environment. Plus, more features to come requires more resources to be used.
Plus, I can’t generate WP debug logs, maybe it’s restricted as well?
Thanks!