I’m getting this exact same issue. First I upgraded from v4 to v5, and everything seems fine, except for this nonce-issue. I then though it had something to do with the the upgrade, so I did a fresh install of WordPress only activating acf5 PRO resulting in the same issue (hadn’t even created any field groups yet). It does go away with wp_debug set to ‘false’, but thats not really a solution.
I dont mind editing the plugin as stated above for now. But this will only work until next update, right?
Thank you for all your hard work Elliot!
