particleInstanceModifier_applyModifier uses getVertCo,which is not implemented by ccgDM. getVertCo was used to simply perform a min/max, so it was fixed to use the apropriate min/max dm->getMinMax(dm, min_r, max_r); Maybe the fact ccgDM doesn't implements getVertCo/getVertNo is a bug, since it implements every other DM function and its strange those are left out.