Hello, that's weird, because it works fine for me and other people. I tested the plugin before releasing the newest version quite properly, so I do not know what might be wrong with it.
It is possible that people who cannot comment are using a banned IP.
Can you comment as an admin? Did you try another IP for commenting as a regular user?
If you have problems with commenting, it would be really helpful if you could kindly let me test the behaviour of the plugin on your site in order to remove any potential bugs.
Thanks for answering.