Strange errors with require or include

I just got PHP 4.02 installed and I have been running into a strange problem. I seem to be having either PHP or Apache (haven't tracked down which one exactly yet, but my guess is Apache) return an error: '[notice] child pid xxxx exit signal Segmentation fault(11)' when accessing pages that require/include multiple files (the error is written to the httpd log file). If I remark out the require/include and paste the code directly into the called page everything works fine. I even get the error if the included file has all code remarked out - it is just the act of 'including' the file that causes the problem. For example: <?PHP require('opendb.php3'); require('authenticate.php3'); require('dbobject.php3'); ?> Will cause the error. If I remark out the second line (require('authenticate.php3')), and paste it's included code into my page, the page works fine. I also verified that it is not the authenticate.php3 script itself as the page will die 'including' any other files also - even one with just remarks in it.