Hey!
I just tested the plugin on 5.1 and it worked for two of my websites.
Let’s see if we can find what’s not working. Can you take a look at the Settings -> Custom body class page? Make sure the post type you want the box on is checked.
Also, can you check the “Restrict for Administrators only” checkbox? With this feature off is a little buggy and I will fix it soon.
If none of these things help, please let me know more about your setup, is it multisite? Are there other plugins to conflict with?
Thanks,
Andrei
Go to the setting page & clock post on & off then save
Checking the “Restrict for Administrators only” checkbox worked for me.
Same thing for me as “gerritelbrink” :
“Checking the “Restrict for Administrators only” checkbox worked for me.”
I found what’s going on here. There’s a very little bug (or feature?).
Clean website, plugin installed, no metabox anywhere.
Gone to settings, hit “save” and the metabox appeared.
Pretty sure “post” / “page” are NOT selected by default in database, even if the appear like selected in options.
Please fix it 🙂