I've updated Tabifier Plugin to support the PSI changes in Demetra, and dubbed it version 5.1.3. It's available for download here: http://pazu.com.br/dav/Tabifier-5.1.3.jar
Note that I didn't upload this to the plugin repository, since I'm not the mantainer for Tabifier. I've only made the (very simple) changes because I can't live without it :) Dave, are still you here? If yes, an official update from you would be more than welcome!