Also, I did have to fix a couple of configs after upgrading. Mostly Allow from All since my document root was not in the WAMP directory. That setting was not saved, but I thought you should know that installing the new ZEND addon, did not cleanup the old entry for the optimizer so the apache server (which worked after upgrading the server) stopped working until I removed the old [ZEND] section of php.ini. I assume 3.0.1 is the current extension.
Hi, I had the same problem ,and not knowing too much about editing config files etc, i just uninstalled WAMP, saved the old WAMP directory (to keep my website files). Then reinstalled WAMP including the ZEND add on, and it works now.