CiviCRM Groups Sync Plugin for Wordpress - No access to Settings
I registered as a Guest user via CiviCRM profile (which includes a create WP user account form) and ... [snip] ... now I've discovered I cannot access the CiviCRM Groups Sync plugin's Settings page


I can't be entirely sure, but I think you may have been confused by the process of registering "as a Guest user via CiviCRM profile". When you do this and create a user account at the same time, CiviCRM will automatically log you in as that user. (FWIW that's one reason I don't use this functionality since there's no way to prevent that from happening) If you subsequently browse your WordPress site as that user, you'll find (depending on the default user role you have set) that you cannot access parts of it. You'd need to log out of WordPress and log in as your admin user to restore your capabilities.


  Also, this plugin does not really help with removing the user when their Civi Membership lapses. So really the member sync plugin would be ideal as it works with the differing Civi Membership states.


As I said in response to another question of yours on SE, this is on my to-do list. Please be patient and remember that the joy of free software is that it's free. My time, on the other hand, is limited - especially in the summer holidays. Luckily for you, funding has indeed been found and set aside to implement this - when I have the time to do so!