Make sure you have not altered the master 'navbar' template. If you have, you will need to replace that template from the master style. You need to be in 'debug' mode in order to view the master style. Please make sure you have a backup of your site before doing this.
If you need to replace the entire master style, you can do so by using 'tools.php'.
See vBulletin manual for more details.
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