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"Zend Optimizer not installed" message on PHP 5.1.1

Since PHP 5.1.0 I'm waiting to Zend release the corresponding version of Zend Studio Server to use the debugging funcionalities provided by the Server.

The current Zend Studio Server only supports PHP 5.0.x versions.
It's frustrating to have the niciest version of PHP but not using it fully.

I hope they will release a new version of the Server soon, or at least update Zend Optimizer to support PHP 5.1.x

Maybe I'm a little anxious for this piece of software, but I really need it to test my applications.