problem: Moderator usergroup can not log in Mod Cp

[Golzarion]

I have a problem about moderator user group : Moderator can Not see Moderation control panel (mod cp ) .... They can not either log in mod cp .... They do not access moderator control panel ....

I use default Moderator user group in vBulletin....

I noticed bellow tips :

Originally Posted by Steve Machol

To troubleshoot this, first reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server. Also be sure to upload the admincp files to whichever directory you have set in your config.php file. Then run 'Suspect File Versions' in Diagnostics to make sure you have all the original files for your version and that none show 'File does not contain expected contents':

Admin CP -> Maintenance -> Diagnostics -> Suspect File Versions

[Note: In some cases you may also need to remove any of the listed .xml files in the includes/xml directory.]

Next, disable all plugins.

Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

Then if you still have this problem, create a new style and choose no parent style. This will force it to use the default templates. Finally empty your browser cache, close all browser windows then try again. Make sure you change to the new style and view your forums with it. Do you have the same problem?

but I still have the problem !!

Is this problem refer to Permissions ??

I ( as an adminstrator of my board ) and my super moderator have no problem and can log in mod cp .... but only Moderator of my board can not log in moderator control panel !!

how can I fix the problem ??