Acabo de actualizar una aplicación que estoy desarrollando de 1.9 a 1.11 y recibo errores constantes en todas las publicaciones de formulario:

CSRF token missing or incorrect.

Todos los tokens CSRF funcionaban bien en 1.9. Aquí está la vista:

def contact(request):
    subject = request.GET.get('subject', '')
    contact_form = forms.ContactForm(subject=subject)

    if request.POST:
        contact_form = forms.ContactForm(request.POST)

        if contact_form.is_valid():
            new_contact = contact_form.save()
            logic.send_contact_message(new_contact, request)
            messages.add_message(request, messages.SUCCESS, 'Your message has been sent.')
            return redirect(reverse('contact'))

    template = 'journal/contact.html'
    context = {
        'contact_form': contact_form,
        'contacts': core_models.Contacts.objects.filter(content_type=request.content_type,
                                                    object_id=request.site_type.pk)
    }

    return render(request, template, context)

Aquí está la plantilla:

            <h4>{% trans "Contact" %}</h4>
            <form method="POST">
                {% include "elements/forms/errors.html" with form=contact_form %}
                {% csrf_token %}
                <label for="id_recipient">{% trans "Who would you like to contact?" %}</label>
                <select id="id_recipient" name="recipient">
                    {% for contact in contacts %}<option value="{{ contact.email }}">{{ contact.name }}, {{ contact.role }}</option>{% endfor %}
                </select>
                {{ contact_form.sender|foundation }}
                {{ contact_form.subject|foundation }}
                {{ contact_form.body|foundation }}
                {{ contact_form.are_you_a_robot|foundation }}
                <button type="submit" class="success button">{% trans "Send Message" %}</button>
            </form>