Robert_Charlton - 8:50 pm on Nov 5, 2012 (gmt 0)
deborahbaker - I've edited one of your earlier posts to remove a link to your site, which has allowed some other members to look at it and give their feedback. As the Google Forum Charter [webmasterworld.com] explains, we ask members not to post such links, for their own protection as well as the protection of everyone here. We don't generally offer public site reviews.
Since you posted the link, though, we now have a situation where some where some comments in this thread are based on observation by those who have seen your site, and some by those who haven't. As it's quite a bit of work to clean that up, I'm going to let those stand, and I'm going to add a comment of my own.
When I took a look, I saw that much of the content on your site is not unique. Though I won't post the specific phrases, one thirteen word text string I searched for in quotes returned 21,800 pages containing the exact text. Almost everything else I saw on the site is quoted on numerous other sites. I don't know whether your content is highly derivative, or whether you've simply been scraped a lot. Perhaps the topic is more popular than you think, or perhaps the prevailing business model in your niche doesn't encourage originality.
It's possible that the change in your structure has caused Google to reevaluate your site... that seems to be Google's pattern now... and that the dupe content may be causing your site to drop. This is apart from the technical problems it appears you're having.