[Solved] Nonce is invalid.
I am unable to post comments, I always receive "Nonce is invalid" message. I have seen this topic addressed by updating plugin version and purging cache. This is a new installation version 7.6.1 and I have purged cache. I have also tried logging in as another user, not as admin.
I am using the plugin for comments on LearnDash courses.
Try to switch on the "Use WordPress native AJAX functions" option in wpDiscuz > Settings > General Settings tab. Again, delete all caches and check it.