Edit httpd.conf - Require/include no longer works - php

Question

Running latest Zend Server on Windows 7x64, I was playing around with different ways to sync htdocs into dropbox and edited two lines of httpd.conf.
DocumentRoot "C:\Program Files (x86)\Zend\Apache2/htdocs"
<Directory "C:\Program Files (x86)\Zend\Apache2/htdocs">
with various symlinks, dropbox locations, etc.
Put it back to the way it was and php includes and require no longer work. I know the scripts are fine as the exact same scripts work on my desktop with the exact same development environment.
I put all my usernames/passwords/database names/etc in a php file that is generally stored outside the htdocs directory.
require_once('constants.php');
(In the same dir for purposes of troubleshooting, have tried everything from $_SERVER to dir.
Throws this error:
Warning: require_once(1): failed to open stream: No such file or directory in C:\Program Files (x86)\Zend\Apache2\htdocs\index.php on line 17
Fatal error: require_once(): Failed opening required '1' (include_path='.;C:\Program Files (x86)\Zend\ZendServer\share\ZendFramework\library') in C:\Program Files (x86)\Zend\Apache2\htdocs\index.php on line 17
Scripts are working fine on another machine with exact same software.
For the purposes of testing scripts, even require_once in same dir doesn't work.
Made a backup of httpd.conf before changing, put it back with no effect.
Copied httpd.conf off healthy machine, no change.
Completely re-installed the entire zend package twice, no change.
At a loss as to what could be causing this. Any ideas?
This is out of the box from the healthy machine, # removed:
DocumentRoot "C:\Program Files (x86)\Zend\Apache2/htdocs"
Each directory to which Apache has access can be configured with respect
to which services and features are allowed and/or disabled in that
directory (and its subdirectories).
First, we configure the "default" to be a very restrictive set of
features.
<Directory />
Options FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
</Directory>
Note that from this point forward you must specifically allow
particular features to be enabled - so if something's not working as
you might expect, make sure that you have specifically enabled it
below.
This should be changed to whatever you set DocumentRoot to.
<Directory "C:\Program Files (x86)\Zend\Apache2/htdocs">
Possible values for the Options directive are "None", "All",
or any combination of:
Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
Note that "MultiViews" must be named *explicitly* --- "Options All"
doesn't give it to you.
The Options directive is both complicated and important. Please see
http://httpd.apache.org/docs/2.2/mod/core.html#options
for more information.
Options Indexes FollowSymLinks
AllowOverride controls what directives may be placed in .htaccess files.
It can be "All", "None", or any combination of the keywords:
Options FileInfo AuthConfig Limit
AllowOverride None
Controls who can get stuff from this server.
Order allow,deny
Allow from all
</Directory>

Answer 1

No quotes are used in Apache config IE:
ServerName yoursite.com
DocumentRoot C:\www\your_site
<Directory C:\www\your_site>
Options FollowSymLinks MultiViews
... rest of stuff
</Directory>
In addition your include may need the absolute path depending on you Apache settings .. IE
require_once('C:\www\your_site\outside_http_docs\constants.php');

Answer 2

Fixed it. Windows permissions requiring file outside the scope of htdocs.