Public Service Announcement for ACF users...
Because of the new directory structure in Sage 9 and the way Sage informs WP by updating the 'stylesheet' option, Advanced Custom Fields looks for the
acf-json directory under
/templates rather than the theme root.
ACF doesn't make it easy to determine where it's looking so this took a bit of flailing to find out...
If using Sage 9, put
acf-json in the