1) Find a copy of Census+ 3.5.1 as the newer versions will not work with Vanilla WoW 2) Change a variable (something like MAX_RETURN_VALUES or something) from 50 to 49.
Census+ works fine after that.
"Well, Zaphod's just this Pope, you know? Ember - Druid - <At Your Service>
* WoW: Open Beta through intro of BC, then back for WotLK and left before Cata*