UUID as PK for Custom User model, django admin problem

Please look at the this ticket https://code.djangoproject.com/ticket/20044 and comments...

Is it possible to create patch for django or/and django-uuidfield to fix issue?

[dbinetti]

I had this same issue, but (for me) it had nothing to do with this library. It was an issue with the session serializer. Changing to the PickleSerializer fixed things.
https://docs.djangoproject.com/en/dev/releases/1.6/#default-session-serialization-switched-to-json

Note This introduces a slight security risk, so don't do it without considering the ramifications.