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Bad ainglish not withstanding... This is what I think you said:
In forum preferences you are using :
Permission Assigned by - Groups
Hide private forums from users without permission - Yes
You have a private forum to which two groups have access:
Webmaster, comite.
When you who are the site admin look at the site, you cannot see the forum, When you add yourself to the comite group, you can see the forum.
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If I have interpreted the circumstances correctly, then one of two things can be true:
1) you are not in the webmaster group
2) the patch is not completely installed
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Next diagnostic steps:
* Create a new user and assign him to the webmaster group only
* determine if he can see the private forum.
* if he can, the problem is likely with your user group record in webmaster group.
* If he can't see the forum, create a second user and assign him only to comite group.
* determine if he can see the private forum.
* If he can see the forum, then the patch may not be completely installed. - Compare the files in the patch with those on your site.
otherwise, use a MySQL database tool such as phpmyadmin to look that the [prefix]_forum_group_access table and look at the rows for this forum. It is possible that something else has damaged the table.
Good luck!