Check your PHP Info page, you can find it under the Maintenance group in the AdminCP.
The reason for this is because you have admin_auth set to On.
Please go to the "XCache Authentification" setting in the "DragonByte Tech: vB Optimise - Misc Options" area and follow the instructions there
Alternatively, turn it off in the php.ini file.
Ensure the password is in cleartext and not MD5 or some other encryption.
Addto your config.php file directly beneath the <?php, then update vB Optimise to use Filecache - assuming you followed the instructions in the readme.txt file and CHMOD'ed the correct folders vBO will workPHP:define('DISABLE_HOOKS', true);
Tried using the Flush Cache link?
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