n00b1 - 7:13 am on Aug 21, 2012 (gmt 0)
It's a manual action as confirmed by Google - what used to be called manual penalties.
I have gone through every single link on WMT and there is nothing like that. I am edging more towards the 'main keyword' overuse from Wiki and DMOZ scrapers as a result of my EMD as explained above. That at least makes some sense to me and can be rectified.