WordPress 3.1.2 Network Enabled non-www to www

Where are you trying to do the force redirect? I think the best place for this may be in a .htaccess file. Something like 

RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.your_domain.com$
RewriteRule ^(.*)$ http://www.your_domain.com/$1 [R=301]

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