Thanks for your help in testing Moodle 2.0.
As far as I know, self-enrolment isn't yet working, due to the major 2.0 enrolments rewrite, MDL-21782. Hopefully all the enrolment stuff will be included in the next preview release, which is due in the next week, so if you could upgrade and test things again then that would be a big help!
Just moving this discussion to the Testing and QA forum...