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If Google can't realize you IMPROVED your site for your visitors then it looks badly upon them, not you.
The only significant change we made was the page names. ... We also had all the content redone by a professional copywriter!
[edited by: incrediBILL at 1:24 pm (utc) on Jul 19, 2010]
Google has possibly reset your site back to zero.
It's like a PR Bomb went off on our site, wiping some pages to 0 and others to 5.
The old URLs are no longer indexed; would rolling back be too late now? META TAGS did change.
People revamp sites and make colossal mistakes
The file names were changed, all other elements were modified slightly.
You shouldn't be making redirects if you want to keep your old pages indexed and their rank.
We also had all the content redone... (...) file names were changed