Solved Allow only specified users to view/post (private part of forum)

Oops, I see you changed your post between the initial one and my reply.
This is my confoguration:

Database collation check: The collation of your table fields are correct

Legacy mode: Disabled | Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |
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Kunena menu details:

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ID	Name	Menutype	Link	Path
111	Forum	kunenamenu	view=home&defaultmenu=113	forum
112	Index	kunenamenu	view=category&layout=list	forum/index
113	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent
114	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic
115	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies
116	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest
117	Profile	kunenamenu	view=user	forum/profile
118	Help	kunenamenu	view=misc	forum/help
119	Search	kunenamenu	view=search	forum/search
120	Forum	mainmenu	Itemid=111	2013-02-09-16-20-38
166	ForumAnnouncement	mainmenu	view=home&defaultmenu=111	2013-03-25-14-47-08

Joomla default template details : eris | author: RocketTheme, LLC | version: 3.2.19 | creationdate: April 2, 2012

Kunena default template details : Blue Eagle 2.0 | author: Kunena Team | version: 2.0.4 | creationdate: 2013-01-18

Kunena version detailed: Kunena 2.0.4 | 2013-01-18 [ Pharmacopoeia ]
| Kunena detailed configuration:

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Kunena config settings:
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| Kunena integration settings:

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Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Enabled: private=1

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (United Kingdom)

Third-party components: UddeIM 2.9

Third-party SEF components: None

Plugins: None

Modules: Kunena Latest 2.0.4

I will investigate your suspicion about changes made on the Kunena permissions, although I'm quite sure I haven't changed anything there...

...as for the "viewing" permissions:

I can't find any setting for that in the Kunena component itself. Under the Options button I can only find a setting to enable/disable configuration and administration access per user group (see attached)

Although these things are actually fairly easy (for someone who has the experience) it's not the easiest thing in the world to explain what do do on a discussion forum. Even face-to-face (e.g. via Skype) can take a while. If you have the time, you could write to me by email and we'll try to discuss the issues but it depends on your availability, your fluency with spoken English and the reliability of the telecommunications medium.

If you have Skype, write to me and we'll try to arrange a one-on-one time.

Oh.. well, I appreciate that very much!
Just sent you an email....

Ernst's problem has been resolved. The test account that he had been using was setup as a global moderator.

I was glad to have been of service.

OK, just for the sake of documentation: Here's how this matter was solved. Hopefully it's useful for those reading this topic later...

I did have that Skype session with Sozzled and we went through all the settings. Actually, everything was as described in previous posts in this topic.
Then I shared my screen and showed that although I was only a registered user, I could still see the forum category that was intended for developers only.

However...: Sozzled noticed that my Kunena user name had this "typical" colour: The colour of a Global Moderator. And yes.... Moderators can see all Kunena content.

Sometimes solutions are very close under your nose....
Thanks again Sozzled!