I didn't get any errors during the reload. Everything looked just fine. At first I didn't do a dropdb, I then did one and would still be unstable.
I then recompiled my PostgreSQL (I was intrigued and thought, why not ?), initdb'd, reloaded the database, and still unstable.
The only way that I solved this was reloading the DB from scratch from the datamodel and modifying the dump with just the tables I wanted (which was a pain in the butt).
