Solved Locked category

rich wrote: "Category Manager > Category > Category Permissions > User Groups Allowed To Post and User Groups Allowed To Reply". You have disabled here Registered Users?
Then, even the Moderator can't create a topic.
You must activate again Registered Users. Then Moderators can create new topics.

I haven't "User Groups Allowed To Post" and "User Groups Allowed To Reply".

I haven't "User Groups Allowed To Post" and "User Groups Allowed To Reply".

It is a section or category? Please create a screenshot of this Category Permission.

rich wrote:

I haven't "User Groups Allowed To Post" and "User Groups Allowed To Reply".

It is a section or category? Please create a screenshot of this Category Permission.

I think you have found the cause, rich.

This topic may be helpful: Move to Locked Category

Screenshot of the Category Permissions.

It's a screenshot of a section. A section is a container for categories for your topics. You must create additionally a category.
See here: www.kunena.org/docs/Simple_forum_setup_instructions

Why is it a section? It has a parent.

"Sections" in Kunena can contain categories or other sections. This is explained in the Wiki article Sections, Categories, sub-Categories (Part 1) .

Sections are sometimes "accidentally" created when you create a category and then lock the category before anyone has posted a topic in it. This is explained in more detail in the topic Move to Locked Category .

No-one can create new topics in a section. If you created a section by mistake (by locking a category before posting a topic) the you have to turn the section back into a category.

I hope that is a better explanation.