I noticed this too. It would appear that the core fields are simply not showing up. I too ran the "Check Community Builder Database" tool and it found some problems and fixed them without any reported problems. However, the name field and email field still do not show up as options in the user list or in the field management tab. All of the custom fields that I added do show up.
I have upgraded three 1.5.3 sites, all of which exhibit this behavior. I also upgraded a 1.0.15 site and it is fine.