Ok, purchased a site yesterday and since I changed wordpress themes (new design), the keyword has dropped nearly 10 spots.. It was ranked in the 4th postition and now dropped down to the 12th spot. It keeps inching back.. I'm not 100% certain the All in One SEO tool is functioning correctly or maybe I toggled with the options too much.. Let me know if someone can help me out here. Thanks
Just curious. Does your on page seo thing change when u change the theme? Maybe thats the reason your SERP drop. I think its something to do with the theme. Check your wordpress and theme setting.
According to My Opinion Dropping are based on Wordpress Theme Changes that are interlinked to plugin. or main header tags.