I have this problem when I write:
You could not process your command because a security token was missing.

The display permits are incorrect
Can you help me?

Do you mean you get this error when you try to add a thread note? What version of vB are you using?

Out of interest, will this work on vB3 at all ?

It would need to be ported; off the top of my head, the templates would need to be changed and perhaps some other minor changes. I will look into porting this to vB 3.8.x very soon. :)

Yes

I using last reelease of vb (4.2.3 pl2)
The write permissions are not set properly for the various groups

I would have to come to your site to troubleshoot, and try to figure out why this is happening on your site. I have installed this on 3 vBulletin 4.2.x installations to date without issue.

Please set up a temporary admin account, and send the login credentials to me by PM. :)

I'm sorry I can not provide login credentials forum.

The plugin allows you to write to all groups and denies to those selected eg Administrator or Moderator. And as if the permits were reversed

Without being able to investigate it firsthand to attempt to determine why your installation has this issue, I'm afraid there's not much I can do. :(

Downloaded, installed, tested, and rated 5 Stars. Nice addition to our Forum.

;).