Are you sure you carefully read everything before installing this product, especially
Quote:
1. I'm getting PHP errors, what gives?
A) You'll need to be using PHP5 for vB Optimise to work.
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Check your config.php edit again, normally there is no way it could fail (it might be necessary to flush your XCache/eAccelerator/APC cache aferwards if you don't check mtime as the server otherwise won't notice that the file was changed).