Includes working in higher directories, not in lower ones

We're running PHP 4.2.1 on IIS 4.0. We've set up PHP to parse all .htm files in a virtual directory. In the root of this directory PHP includes work just fine, but when we get deep, they return this error... Warning: Failed opening '../../../includes/leftnavbarag.htm' for inclusion (include_path='.;c:\php4\pear') in D:\Netscape\SuiteSpot\docs\cms\dev\subsections\news\dirwlcme4.htm on line 15 (The Netscape path is from our previous server app). I've tried both relative and absolute paths ( '/myserver/dev/includes/leftnavbarag.htm' ) without solution. I've even tried full http paths and it doesn't work. The file calling the include resides in /myserver/dev/subsections/news/default.htm. "news" is a newly-created directory, after the PHP parsing was set up. Is it possible that PHP parsing isn't working in this subdirectory of the virtual server 'myserver'? If it's a problem with the include_path, can you tell me what it needs to be? Thanks!