Hi Jonathan, I marked my reply as ‘solving the issue’, since then, the buttons to mark YOUR post as the solution have disappeared. Would this be a bug in the forum (@elliot)? or do I miss something?
BTW: the fix was done on the git-source (I suppose), so initially your relationship.php broke the ACF plugin (version 4.2.0). I moved your changes to the relationship.php from 4.2.0 and that worked!