You need to pick up a fresh version of OpenACS 4.5 from cvs. The tag's "oacs-4-5".
I disabled the user profile group as it's broken in practice and probably principle.
I fixed the way the groups are constructed. There was one error that affected both the Oracle and PG versions (and aD's original ACS 4.2) and another that affected the PG version only.
I'm planning on trying to push out the real release tarball by mid-May but in the interim just use the 4.5 branch of the CVS tree.
(bugs fixed in 4.5 will get merged into the development branch when I cut the final release tarball).
