vBSEO won't redirect to pretty URLs under nginx

We're attempting to switch our forums to nginx. The switch went well for the most part (all URLs work, etc.). The only issue we're having under nginx is that site.com/showthread.php?p=123 doesn't redirect to the pretty URL like it does under Apache.

We've switch back to Apache for the time being, but any help would be appreciated.

Hello,

please try this: Problem with moving posts with Nginx