The Slony team has released a bug fix release for Slony 2.1.  Slony 
2.1.3 is the next release in the 2.1 series. This release includes the 
following changes from 2.1.2



- Bug #285 :: Fix race condition with MOVE SET where a third node
   could get updated to the wrong SYNC number
- Bug #276 :: Fixed duplicate key detection on sl_nodelock
- Bug #278 :: assorted spelling fixes
- Add in explicit support to recognise PostgreSQL 9.2, rather than
   warning that it may not be supported
- Add --with-pgport option to configure and when set to yes let slonik
   use these functions to determine the PGSHARE directory at runtime.
   This defaults to no

Users of 2.1.1 or 2.1.2 that make use of the MOVE SET command and have 
three or more nodes in the cluster are encouraged to update to 2.1.3 as 
soon as possible.