Apache "Document Contains No Data" Errors

I have been trying to develop a user management system of sorts, but have had a lot of trouble with "Document Contains No Data" errors. I've gone through and made sure all the paths are correct for the files that I've included. I've tried to break down the script into it's simplest parts (and couldn't reproduce there error). I've tried echoing out values before and after the includes with and without calling exit explicitly (the before echos worked, the after didn't). I have Apache parsing all HTML files as PHP. The create_profile.html calls post_add.html which includes post_check.html and status_mail.lib.html. I've thuroughly tested the later alone and with other scripts and it doesn't seem to be the problem. I can't even call post_check.html by itself without getting an error. Server Specs: System: SunOS unionbay 5.6 Generic_105181-17 sun4u sparc SUNW,Ultra-4 Build Date: Feb 20 2000 Configure command: ./configure '--with-mysql' '--with-apache=../apache_1.3.11' '--enable-track-vars' '--disable-debug' '--without-gd' '--with-mcrypt' '--with-mhash' '--with-zlib' '--enable-xml' '--enable-inline-optimization' php.ini path: /usr/local/lib ZEND_DEBUG=0 SAPI=Apache ZTS is undefined Zend Engine v0.90 Joel

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