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The only thing that has changed to the site in the last month is the design, no content changes just the design and we are in stable positions for all of our other key words.
Has anyone else experienced this problem. or know why this could be happening?
With design changes usually comes code changes - so did you change the code in any way?
Also did you keep the same filename - just to make sure that really nothing else changed?
Did the content remain exactly the same word for word? Did the code structure remain the same (ie. if you were using h1 and h2 do you still use the same structure)? Did the meta info change in any way?
If everything is the same apart from the tables that are now divs, it may be and impact of code / content ratio - it something that should resolve itself after some time.
We did change the content of the site, we tried to keep with in the keyword density of the previous site.
We have updated the <h1>, <h2> etc. tags to be more user friendly but kept withing SEO's hierarchy.
I have checked the search term on a remote computer and the the position of the search term has stayed on page 6, though when i search here its not anywhere, could this just be a fluctuation.
Keyword density per say, is really something that you should not worry about. As long as you write 'naturally' - ie. avoid keyword repetition / spamming - it should be OK.
So if you change the content, the structure and the code it may be some temporary 'fluke' because you changed to many things at the same time, or it may be a new position that Google re-calculated and G think it's where your site should be.
In either case the best thing to do right now is ... wait. Do nothing on the main pages for a couple of weeks to confirm whether it's one or the other, and if it is a permanent thing, try to create new content / new pages that target the keyword you lost position on. It usually take a couple of weeks for something like this to settle.
You could try an gain a couple of new links from relevant sources (or do a couple of news articles and publish them on news sites).
If the keyword was vital to your revenues, consider PPC as well to fill the revenue gap or write the new page(s) straight away and drip feed them to the site over the next couple of weeks.
Oh, one more thing... along the lines of what le_gber said, be patient! Change one thing at a time and see what happens. If you approach it that way you can identify what's working and what's not and make improvements to what is actually working.
[edited by: SEOMike at 6:01 pm (utc) on Feb. 29, 2008]