I had the same problem planetrap.... I ended up having to replace everwhere it said storep in the contest and points phps with field6 (The field my points are in) and changing user to userfield.
Seems to work... at least so far. Look where it says ***start enter contest*** in the contest.php and where it says ***startdopoints*** in the points.php
P.S. Don't know if it's relevant but I'm using 2.2.9

aranoid: