Cookies would be the only guess I would have on this as well. The user Keimos posted an explanation in this thread that makes sense.

We first noticed it when one of our users did a search and their results were different than ours on both our systems.

Usually we are pegged with a Google ranking on the first page of many standard searches for writing resources, and we know that and use it in our promotions.

Doing so resulted in a user contesting our advertising because we didn't show up on his MAC OS7 machine the way that we claimed we should.

Our XP systems all showed we were in #1 spots. His system showed us all over the map.

It's taken a while to sort this out and it's very annoying in that there is no consistency (until now) with what was causing the problem.

Cookies! argh!

So to kill these cookies on our machines what should we look for? And to block them how do we do it? What are the disadvantages to killing and blocking these annoying little pests that skew results anyway?

Any help input would be greatly appreciated.

Mark London
Freelance Writing Organization International
http://www.fwointl.com
Inkwell Newswatch (IN) ezine
http://www.fwointl.com/in.html