it is impossible to migrate an empty (initial) database when there is a custom User model.
MAYBE this is South's bug or a bug in other components, but I am testing Django 1.5 since a few hours and it's really hard for me to tell that, esp. when it comes to migrations... so please have a look at it and tell me please, am I right?
C:\Users\dotz\Desktop\admintoolsbug>manage.py migrate Running migrations for menu: - Migrating forwards to 0001_initial.
menu:0001_initial ValueError: Cannot successfully create field 'user' for model 'bookmark': "The model 'myuser' from the app 'proof' is not available in this migration.".