V3 cert fix in thumbslug master: 6aea48dc27825f84b5de2cf43be46200c52a73d2 Appearing in 0.0.31. Hotfix build already completed: 0.0.28.1.
Verified: # rpm -q thumbslug thumbslug-0.0.28.1-1.el6_4.noarch
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2013-0686.html
https://access.redhat.com/site/solutions/353183 created in Knowledge Base based on this Bugzilla / errata.