Why is my Django installation delivering an empty HTTP response?

Final Update: There was a stray LoadModule python_module modules/mod_python.so that conflicted with mod_wsgi. Removing that LoadModule made everything work again.

I am setting up a production server with Django and following along with the Django tutorial, yet receiving a blank page (or, as Chrome likes to report, Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error.) when I visit http://domain.com/mysite.

# httpd.conf

LoadModule wsgi_module modules/mod_wsgi.so
WSGIScriptAlias /mysite /home/gibson/mysite/django.wsgi

# django.wsgi

import os
import sys

sys.path.append('/home/gibson')

os.environ['DJANGO_SETTINGS_MODULE'] = 'mysite.settings'

import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

I've also attempted using a very basic mod_wsgi test application (as found in the mod_wsgi wiki), which behaves as expected:

# django.wsgi (test)

def application(environ, start_response):
    status = '200 OK'
    output = 'i live!'
    response_headers = [('Content-type', 'text/plain'),
                        ('Content-Length', str(len(output)))]
    start_response(status, response_headers)
    return [output]

Is there something else I could be forgetting? I appreciate the insight.

small update: For giggles, I checked my Apache error_log:

[notice] child pid 18356 exit signal Segmentation fault (11)

Googling for this gem returned some stuff about Django's caching mechanism (which I don't use) and conflicts with loading the mod_python module (which I've commented out in my httpd.conf).

Update 2: (comments removed for brevity)

# settings.py

DEBUG = True
TEMPLATE_DEBUG = DEBUG
ADMINS = (
)
MANAGERS = ADMINS
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3', 
        'NAME': '/home/gibson/mysite/sqlite3.db',
        'USER': '',
        'PASSWORD': '',
        'HOST': '',
        'PORT': '',
    }
}
TIME_ZONE = 'America/Chicago'
LANGUAGE_CODE = 'en-us'
SITE_ID = 1
USE_I18N = True
USE_L10N = True
MEDIA_ROOT = ''
MEDIA_URL = ''
ADMIN_MEDIA_PREFIX = '/media/'
SECRET_KEY = '[redacted]'
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
)
MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
)
ROOT_URLCONF = 'mysite.urls'
TEMPLATE_DIRS = (
)

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
)

# urls.py

from django.conf.urls.defaults import *
urlpatterns = patterns('',)

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Why is my Django installation delivering an empty HTTP response?

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