I believe you are referring to errors that cause php-cgi processes to exit immediately after start.
There are few reasons that can cause this behavior, and I'd like to see Zend Enabler's log (typically,
located in C:\Program Files\Zend\ZendServer\logs\ZendEnabler.log ) to determine the exact error and suggest proper solution.
If you were able to isolate the problem and reliably detect that it only occurs when Optimizer+ is loaded and enabled,
the issue can be solved using the configuration changes described in the following Zend Knowledge Base article:
Please try adding the recommended directive (zend_optimizerplus.mmap_base with suggested values) and restart Zend Server.
Please let me know if this helps.
This is definitively the solution for our problem, thank you very much!
Since we've added the directive the problem never occurred again on any of the two webservers.