Help! Google Traffic Disappear on My Site

I have modified the footer internal links and title which link to another category on my web page at the bottom of the homepage at 4/21/11. But after that, i find that My keywords(include Long-Tail Keywords) are not showing in google search, and my Google traffic dropped 90% starting on 4/22/11, I don’t know what happened? i search and what to find out the answer at google, it said that maybe the over optimization problem. So i remove any over optimisation(links) which i added before. Until now they were not showing up on google.

Any and all advice is appreciated.

Thanks.

Are you sure it’s the only thing you’ve changed? Maybe your site was just hit by the recent update. It’s hard to pinpoint as we do not have all the details.