Hi there, I've got the same problem after trying to upgrade to the latest WP version, I think 3.5, my site http://www.saboi.co.za
The .htaccess file was completely blank and I've put in the following code:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
Now I only get a blank page when visiting my site