Just fixed a bug in dotLRN-pg that gave a server error when trying to drop membership from a community.
The error is a typo in the sql datamodel that gets loaded at package installation, so simply updating updating from cvs won't do the trick unless you reload the entire db. To avoid having to do that, type this in plsql:
update acs_object_types set id_column='rel_id' where id_column='red_id';
