Upgrade Notes
When upgrading to SpamAssassin 3.1.x, it is essential that you read [http://svn.apache.org/repos/asf/spamassassin/branches/3.1/UPGRADE the SpamAssassin 3.1.x 'UPGRADE'] file.
If you run into any problems, or some functionality appears to stop working, read that file (again). If it's not dealt with there, check FrequentlyAskedQuestions – especially the Installation and configuration... section.