Changed the avatar upload_to path to not rely on the user supplied name, as this has caused problems in the past (too long). Now just store avatars under media/avatars/users/username.ext.

{% extends 'base.html' %}
{% block title %}{{ flatpage.title }}{% endblock %}
{% block content %}
<h2>{{ flatpage.title }}</h2>
{{ flatpage.content }}
{% endblock %}