in entity.mm
void Entity::EntityType(int type_no,int recursive){
// add to collision entity list if new type no<>0 and not previously added
if(collision_type==0 && type_no!=0){
CollisionPair::ent_lists[type_no].push_back(this);
}
// remove from collision entity list if new type no=0 and previously added
if(collision_type!=0 && type_no==0){
CollisionPair::ent_lists[type_no].remove(this);
}
...
should be
void Entity::EntityType(int type_no,int recursive){
// add to collision entity list if new type no<>0 and not previously added
if(collision_type==0 && type_no!=0){
CollisionPair::ent_lists[type_no].push_back(this);
}
// remove from collision entity list if new type no=0 and previously added
if(collision_type!=0 && type_no==0){
CollisionPair::ent_lists[collision_type].remove(this);
}
...
the remove from collisions entity list was attempting to remove the entity from the list it was being added to (type_no) which was 0 rather than the list it was currently in (collision_type). causing it to be impossible to set an entity type back to 0 once it was set.
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