I have a Pligg site that is a version 9.6 and when I set the site up originally I changed the DB tables name from pligg_ to whatever_ and now when I try to run the upgrade script to 9.7 it cannot read the existing tables and I don't know how to change that!! I would be interested in somebody who could upgrade the site to 9.7 for me! Please post or PM me if you can do this and how much!!
you could ask this in their irc channel (#pligg) on the freenode network, good chances for help there... doesn't sound like a big problem...