Login Page (Almost ) Blank - Can't Login

[danielflippance]

My login page is (almost) entirely blank on my production server but works ok on dev and staging (heroku). I can see the home page and I can create an account and see the profile page, but I cannot login to an existing account:

There are no javascript errors in the browser and no errors in the server side log:

21/3 14:33 [24540] - info: NodeBB v0.9.2 Copyright (C) 2013-2014 NodeBB Inc.
21/3 14:33 [24540] - info: This program comes with ABSOLUTELY NO WARRANTY.
21/3 14:33 [24540] - info: This is free software, and you are welcome to redistribute it under certain conditions.
21/3 14:33 [24540] - info:
21/3 14:33 [24540] - info: Time: Mon Mar 21 2016 14:33:07 GMT-0500 (PET)
21/3 14:33 [24540] - info: Initializing NodeBB v0.9.2
21/3 14:33 [24540] - info: Environment: production
21/3 14:33 [24540] - verbose: * using mongo store at xx.xx.xx.xx:xxxx
21/3 14:33 [24540] - verbose: * using themes stored in: /var/www/blahblahblah/live/node_modules
21/3 14:33 [24540] - info: [database] Checking database indices.
21/3 14:33 [24540] - verbose: Checking dependencies for outdated modules
21/3 14:33 [24540] - verbose: [notifications.init] Registering jobs.
21/3 14:33 [24540] - verbose: [meta/css] Minifying LESS/CSS
21/3 14:33 [24540] - verbose: [sounds] Sounds OK
21/3 14:33 [24540] - verbose: [meta/templates] Compiling templates
21/3 14:33 [24540] - verbose: [meta/templates] Successfully compiled templates.
21/3 14:33 [24540] - verbose: [meta/css] admin.css committed to disk.
21/3 14:33 [24540] - verbose: [meta/css] stylesheet.css committed to disk.
21/3 14:33 [24540] - verbose: [meta/js] Minification complete
21/3 14:33 [24540] - verbose: [hotswap] Router with id plugins replaced successfully
21/3 14:33 [24540] - verbose: [plugins] All plugins reloaded and rerouted
21/3 14:33 [24540] - verbose: [hotswap] Router with id auth replaced successfully
21/3 14:33 [24540] - verbose: [meta/js] Client-side minfile committed to disk.
21/3 14:33 [24540] - info: NodeBB Ready
21/3 14:33 [24540] - info: Enabling 'trust proxy'
21/3 14:33 [24540] - info: NodeBB is now listening on: 0.0.0.0:4567