Solved Pagination doesn't work

Go to Kunena -> Plugins and disable the CommunityBuilder and Uddeim plugin. Then empty the cache and try it again. Test it also with the default templates Protostar and Crypsis.

I tried that just now, but the problem remains. I don't think that the issue is caused by a Kunena or Joomla template (and, so it seems, not by the CB and UddeIM plugins either).

I do notice that, if my website is set to "offline", clicking on the pagination just sends me to the home page. But when the site is set to "online", it sends me to the 404 error page instead (even when I'm still logged in with the same admin account).

I don't think that the issue is caused by a Kunena or Joomla template (and, so it seems, not by the CB and UddeIM plugins either).

We had already a similar problem, but the error was caused by it was AlphaUserPoint. Therefore I thought.
When you click on Next, includes the address the word "components"?
And have you already counted all kunena statistics (Backend -> Kunena -> Tools), and synchronisized the CB database tables?

I don't use AlphaUserPoint. Pity, otherwise it might already have been resolved then lol

I can't click "next", only on the number of a page. For example, when I click on "2" in the list of topics in a forum, the URL looks like this;

..../index.php/en/forum?view=category&defaultmenu=1505&catid=4&start=20


When doing the same in a list of replies inside a topic, the URL looks like this:

..../index.php/en/forum?view=topic&catid=4&id=128083&start=10


This is with "Search Engine Friendly URLs" disabled in Kunena configuration. With it enabled in Kunena, the topic list URL looks like this:

..../index.php/en/forum/4-ask-the-council?start=20

And within the replies of a topic named "gender" like this:

..../index.php/en/forum/4-ask-the-council/128083-gender?start=10

Also, I tried the statistics recount in Kunena Tools, and did all the database tools in CB, cleared cache, and tried again, but still the same

A few things I tried:
- Tried to create a new Kunena Category menu item, used that to load the forums and tried again, same result

I checked your menus. The sort of the menu items are not correct.
Example:
The menu item 1504 Forum linked to the defaultmenu=1505 and target is forum/index
The menu item 1513 Forum linked also to the defaultmenu=1505 but the targed is forumnl
You can't use sundry targets with the same menu ID.
But that's only a single example. You have more then one menu items with the same target, but different address.
You must repair the menu items, otherwise remain the problem.