On Jan 28 - 2013 google dropped many of our keywords from its index.Here is the history of Rank
June 24 2012 - RANK 2 Nov 18 2012 - RANK 8 NOV 25 2012 - RANK 15 JAN 6 2013 - RANK 10 JAN 13 2013 - RANK 21 JAN 20 2013 - RANK 9 Jan 27 2013 - RANK 6 JAN 28 2013 - DROPS OUT OF GOOGLE
Graph
http://i.imgur.com/ABYJ3MS.jpg
The ON PAGE is an A for the homepage, errors and warnings are all DOWN over time.
Would the last Google Update have caused this?
Bing and Yahoo went UP and google dropped right out
http://i.imgur.com/vP8Uvu8.jpg
The red box is the keyword in question, but many others dropped out of top 50
Anyone have any ideas on what I should look for or which update could be responsible?