Hey not sure if this helps but i just had the same problem.... Open the hcaccess file. clear it and replace with the following.
#DirectoryIndex index.php index.html
#Options +FollowSymLinks
#Options -Indexes
<IfModule mod_rewrite.c>
RewriteEngine On
#RewriteBase /relative/web/path/
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^(.+) - [PT,L]
RewriteCond %{REQUEST_URI} !=/favicon.ico
RewriteRule ^(.*) index.php
RewriteCond %{HTTP:Authorization} !^$
RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]
</IfModule>
#php_value register_globals 0