Before changing anything: The buttons are controlled by Facebook All Display Configuration (Choose Social Provider). I noticed after upgrading, you need to turn these on again.
Now I’m assuming you have your wordpress in a folder (https://www.example.com/wordpress) and are running your site from (https://www.example.com/).
This means:
- Site URL = https://www.example.com/wordpress
- Home URL = https://www.example.com/
Occurances of site_url() in 1.6 that I have found:
- 2 in facebookall_admin.php
- 5 in facebookall_view.php
- 5 in facebookall_process.php
Note, Be sure:
- You have home set in the options table in your database. If it isn’t, home_url() won’t work.
- The value in field above is the same as the one you put in the API.
Other than than that, facebookall_admin.php is a massive file. If you change it and the save does not complete, you break the plugin. I would suggest editing with website CPanel Code Editor; or on your own computer and uploading the files. I wouldn’t recommend editing this file with the WordPress plugin editor.