Zend Problem after PHP Update

[timchase01]

Hi Everyone...I'm hoping that someone can help me figure this out. My system administrator recently updated our version of PHP to 5.1.4 for security issues. We were on 5.0.5 before. After the update of PHP whenever I tried to load a page that has the require statement for the calendar I am getting a message saying that the zend optimizer is not installed. So I had him update the zend optimizer to 3.0.0. However, this did not fix the problem. So then I loaded the test script and it also agrees that it can't find zend. So the my admininistrator roled PHP back to 5.0.5 and now it works great again.

Does anyone have any ideas? He doesn't want to stay on 5.0.5 for long because of some security risks.

Thanks!
Tim