fathom - 11:55 pm on May 13, 2012 (gmt 0)
Was I hit by Penguin?
I highly doubt it... PENGUIN is 100% about unnatural links... while that "might" include something like articles for links where a copied article points to an original... 1 instance won't change anything.
Your loses/gains are unlikely associated with your edits... more likely they are associated with the recalculating of page ranks as swaths of pages around you bound with each devalue or recovery... e.g. if you have links from a domain that devalued... you lost the value from them... and when they recover so do you (all other things being equal).