Why is Django Caching my static with django.views.static.serve?

I have static.serve setup on my local development server, but it seems to cache static files (in my case, css, javascript and images) until I restart the the server. I am not using apache, and I have the cache set to:

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
    }
}

Removing the caches declaration all together doesn't seem to help either.

This didn't happen before I upgraded to 1.2.5 from an older 1.1 version.

It's a pain to have to restart the dev server every time (either by touching a python file or via the command line) every time I make a style update.

Edit - as suggested, I've added settings.py and url.py

Settings.py

# Django settings for zeiss_elearning project.
from django.utils.translation import ugettext_lazy as _
gettext = lambda s: s

DEBUG = True
TEMPLATE_DEBUG = DEBUG

ADMINS = (
    ('Jason Roy', '###'),
)

#Email settings

EMAIL_HOST = '###'
EMAIL_HOST_USER = '[email protected]'
EMAIL_HOST_PASSWORD = '####'
DEFAULT_FROM_EMAIL = '[email protected]'
MANAGERS = ADMINS

DATABASES = {
'default': {
    'ENGINE' : 'django.db.backends.mysql',   
    'NAME' : '###',
    'USER' : '###',
    'PASSWORD' : '###',
    'HOST' : '/Applications/MAMP/tmp/mysql/mysql.sock',
}
}

TIME_ZONE = 'America/Tijuana'


LANGUAGE_CODE = 'en-us'

SITE_ID = 1

USE_I18N = True

USE_L10N = True

MEDIA_DEBUG_DOC_ROOT = '/Users/jason/Bird Takes Bear/Projects/Carl Zeiss/site 2.0/media'
MEDIA_ROOT = '/Users/jason/Bird Takes Bear/Projects/Carl Zeiss/site 2.0/media'

MEDIA_URL = '/static_files/'

ADMIN_MEDIA_PREFIX = '/media/admin/'

# Make this unique, and don't share it with anybody.
SECRET_KEY = '####'

# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
#     'django.template.loaders.eggs.Loader',
)

MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.doc.XViewMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'cms.middleware.page.CurrentPageMiddleware', 
    'cms.middleware.user.CurrentUserMiddleware', 
    'cms.middleware.toolbar.ToolbarMiddleware',
    'cms.middleware.media.PlaceholderMediaMiddleware',
    #'django.middleware.cache.FetchFromCacheMiddleware',
    #'debug_toolbar.middleware.DebugToolbarMiddleware',
)

ROOT_URLCONF = 'zeiss_elearning.urls'

TEMPLATE_CONTEXT_PROCESSORS = (
    'django.core.context_processors.auth', 
    'django.core.context_processors.i18n', 
    'django.core.context_processors.request', 
    'django.core.context_processors.media', 
    'cms.context_processors.media',
)

TEMPLATE_DIRS = (,
    '/Users/jason/Bird Takes Bear/Projects/Carl Zeiss/site 2.0/templates',
    '/Users/jason/Bird Takes Bear/Projects/Carl Zeiss/site 2.0/cms/templates',
)

SESSION_COOKIE_AGE = 86400

LOGIN_URL = '/membership/login/'

LOGIN_REDIRECT_URL = "/"

AUTHENTICATION_BACKENDS = ( 
    'zeiss_elearning.shared.email_auth.EmailBackend',
    'django.contrib.auth.backends.ModelBackend',
)
AUTH_PROFILE_MODULE = 'membership.UserProfile'
FORCE_SCRIPT_NAME = ''

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.admin',
    'cms',
    'cms.plugins.text',
    'cms.plugins.picture',
    'cms.plugins.link',
    'cms.plugins.file',
    'cms.plugins.snippet',
    'cms.plugins.googlemap',
    'cms.plugins.zeiss_video',
    'cms.plugins.html',
    'cms.plugins.quiz',
    'cms.plugins.popup',
    'mptt',
    'publisher',
    'zeiss_elearning.forms',
    'zeiss_elearning.membership',
    'zeiss_elearning.quiz',
    'menus',
    'south',
)
INTERNAL_IPS = ('127.0.0.1',)

#CMS Settings


CMS_REDIRECTS = True
CMS_MENU_TITLE_OVERWRITE = True
CMS_DBGETTEXT = False

CMS_DEFAULT_TEMPLATE = 'base.html'
CMS_ALLOW_HTML_TITLES = False

CMS_TEMPLATES = (
    ('base.html', _('Default')),
    ('cirrus.html', _('Cirrus')),
    ('atlas.html', _('Atlas')),
)

# Site title for your template
CMS_SITE_TITLE = 'Zeiss Cirrus'

CMS_LANGUAGE_REDIRECT = False

CMS_LANGUAGES = (
    ('en', gettext('English')),
)
LANGUAGES = (
    ('en', gettext('English')),
)
CMS_APPLICATIONS_URLS = (
('zeiss_elearning.quiz.urls', 'Quiz')
)

urls.py

from django.conf.urls.defaults import *
from django.contrib import admin
from django.conf import settings

admin.autodiscover()

urlpatterns = patterns('',
    (r'^membership/', include('zeiss_elearning.membership.urls')),
    (r'^admin/', include(admin.site.urls)),

)
urlpatterns += patterns('',
    url(r'^', include('cms.urls')),
)
if settings.DEBUG:
    urlpatterns += patterns('',
        (r'^static_files/(?P<path>.*)$', 'django.views.static.serve',
        {'document_root': settings.MEDIA_DEBUG_DOC_ROOT}),)