Creo que encontre la solución en un foro gringo!!!
en el .httacces colocar esto
Cita: <IfModule mod_security.c>
# Turn off mod_security filtering. SMF is a big boy, it doesn't need its hands held.
SecFilterEngine Off
# The below probably isn't needed, but better safe than sorry.
SecFilterScanPOST Off
</IfModule>
el mio quedo asó
Cita: # BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wordpress/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wordpress/index.php [L]
</IfModule>
# END WordPress
<IfModule mod_security.c>
# Turn off mod_security filtering. SMF is a big boy, it doesn't need its hands held.
SecFilterEngine Off
# The below probably isn't needed, but better safe than sorry.
SecFilterScanPOST Off
</IfModule>
via: http://www.simplemachines.org/community/index.php?P=864181742e10402366f8e2248589c322&topic =34270.0