After a bunch of emails back and forth with a client, I finally discovered that she couldn’t see the content editing blocks because she had unknowingly moved the settings to the sidebar, using the new handle-actions buttons (higher + lower).
Would be nice if there was a way to disable those buttons without having to write this into the admin styles.
Had the same issue with a client. I ended up added the following CSS in the admin for the site
.acf-postbox button.handle-order-higher,
.acf-postbox button.handle-order-higher+span,
.acf-postbox button.handle-order-lower,
.acf-postbox button.handle-order-lower+span{
display:none;
}