Large traffic drop from search engines - what should I check?

Hi, so from last Friday on there's been a severe drop in traffic from search engines. Where I've been getting about 3,500 visits a day, I am now getting around a thousand.

The last time this happened (last year around May) my site was infected and visitors were getting redirected. I was not able to catch and resolve the issue until a month or so after it started.

I've tried to see if my site is being redirected now, also asked other members of my forum to check - all seems well so far.

I used the rogue plugin checker, and looked through the list manually - all seems to check out just fine. Nothing I can't recognize.

Any other thoughts on what I should do?

Yikes, I just noticed my page rank dropped from 4 to 3? Was I punished by google for something?

Hello,

make sure that you are running the latest version of vBSEO and try this tool to check whether there are any suspicious plugins in DB: FAQ's on the Rogue Plugins Exploit (1/23 vBSEO Patch Release)

Im seeing all my seo traffic gone, and i just searched for my site on google and it redirected me to someone elses site.
Is there an exploit, I'm running v3.6

Please check the suggestion from post #3 above.