The Zend_Amf_Request::initialize() method throws an exception on case-sensitive file systems due to incorrect case preventing the autoloader from including Zend_Amf_Parse_Amf0_Deserializer.

The Deserializer.php file is found in the 'Zend/Amf/Parse/Amf0/' folder, not 'Zend/Amf/Parse/AMF0/'

I fixed this issue on my own system by replacing

$this->_deserializer = new Zend_Amf_Parse_AMF0_Deserializer($this->_inputStream);

with

$this->_deserializer = new Zend_Amf_Parse_Amf0_Deserializer($this->_inputStream);

If I can provide any more information that may be of use to you, please ask.

Thanks

Matt