Audience targeting on navigation not working

Hello everyone,

I recently came across a SPS 2010 (SP1) installation where audience targeting not working. I target a navigation link to a “SharePoint group” audience but people not member of that group still can see the link. I tried this on a team site with publishing features turned on and also on a publishing site both behaves the same way. I do the same steps on another 2010 farm and audience targeting works as expected.  

Tried toggling navigation security trimming, audience targeting (from Site Collection Navigation Settings) without any luck. Any suggestions would be appreciated.

Many thanks in advanced!

BlueSky2010
Please help and appreciate others by using these features: "Propose As Answer", "Vote As Helpful" and"Mark As Answer"