Preview Posts doesn’t work after SIteURL change

A fresh install of WordPress in a sub-directory. Enabled Pretty Permalinks. -All checked and works.

Immediately after enabling Permalinks, i changed the SiteUrl in General Settings for my Site to http://domain.com . -This also works in the front-end.

*However, i can no longer preview Posts; either a new Post, or changes i’m making to an already published Post.*

The message in the preview-window that is opened says: “Sorry, you are not allowed to preview drafts”, on an otherwise empty screen.

I’m pretty sure now that i’ve done the installation correctly; that the .htaccess has been updated during Permalink and URL changes, then copied over to root directory; along with index.php, which has been appropriately edited.

*index.php in root-directory* looks like this:

<?php
/**
* Front to the WordPress application. This file doesn’t do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/

/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define(‘WP_USE_THEMES’, true);

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . ‘/sub-directory/wp-blog-header.php’ );

.htaccess in root-looks like this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /sub-directory/
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /sub-directory/index.php [L]
</IfModule>

# END WordPressdirectory

.htaccess in the install (root) directory looks like this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /sub-directory/
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /sub-directory/index.php [L]
</IfModule>

# END WordPress