The following 2 updates to thunderbird were pushed to stable in bodhi in the wrong order, so that the update to 3.1.9 has superseded the update to 3.1.10 in the repos:

$ koji list-tag-history --tag=dist-f14-updates --package=thunderbird|tail -2

Fri Apr 29 20:53:33 2011: thunderbird-3.1.10-1.fc14 tagged into dist-f14-updates by bodhi [still active]

Sat Apr 30 21:35:18 2011: thunderbird-3.1.9-2.fc14 tagged into dist-f14-updates by bodhi [still active]

Please make sure that the mash scripts pick up 3.1.10. It was suggested on fedora-devel to untag the 3.1.9 build.

Please see for details the thread on fedora-devel:
http://lists.fedoraproject.org/pipermail/devel/2011-May/151091.html .