Jesse Kornblum released a new version of his fuzzy hashing tool ssdeep this week.  This release fixes a problem that was apparently introduced with version 2.10 in July 2013.  If you use ssdeep, you are encouraged to update and if you have the time, you may want to recompute the v2.10 hashes in your database.

References:

http://jessekornblum.livejournal.com/295883.html

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Jim Clausing, GIAC GSE #26
jclausing --at-- isc [dot] sans (dot) edu