Hey guys I know this issue is a bit old, but I just wanted to shout out here to let you all know the issue has been fixed.
I did not realize there was a special forum for asking questions related to my plugin! I just found all of these today and promptly solve as many bugs as I could.
I just pushed version 2.4 which has been tested with the latest version of WP and fixes your issue. Problem was, I was storing the names in the DB from my code rather than pulling them directly from the code. That has been fixed, so if you edit the naming in sg.php, it will reflect that on your site.
Happy blogging!
— Michael