CAUTION! The rollback may worsen your problems.
– After the UM 2.04 update we had many problems with the directory (disappeared), registration (stopped working), and emails (raw code, wrong emails sent), but our menus and restricted content areas still worked.
– After the rollback to 1.3.88, our menus and restricted content areas broke all content was visible to everyone.
– We deleted our UM extensions and then tried to run the 2.04 update again. The update ran smoothly, but the broken menus and restricted areas remained.
– Our only choice then was to restore the entire WP database to an earlier state, so we lost all our work on the site since the original UM 2.04 update.
Good luck.