Blank screen instead of welcome page in new app

I'm just learning ember, so sorry if this is a stupid question. I've not added any logic to my app yet, but I'm already having difficulty getting the ember welcome screen. Instead of the ember welcome screen, I get a blank screen but with no errors in the console or the browser. I've isolated the problem to this specific combination of packages (see package.json) but I'm not sure which one is causing the issue. No application code has been added; if you use this package.json file and run npm install, you should also find that the welcome screen fails to load.

package.json:

{
  "name": "against-humanity",
  "version": "0.0.0",
  "description": "",
  "license": "MIT",
  "author": "djcf",
  "directories": {
    "doc": "doc",
    "test": "tests"
  },
  "repository": "",
  "scripts": {
    "build": "ember build",
    "start": "ember server",
    "test": "ember test"
  },
  "devDependencies": {
    "ember-ajax": "^3.0.0",
    "ember-cli": "~2.14.1",
    "ember-cli-app-version": "^3.0.0",
    "ember-cli-babel": "^6.3.0",
    "ember-cli-dependency-checker": "^1.3.0",
    "ember-cli-emberscript": "0.0.18",
    "ember-cli-emblem": "^0.9.0",
    "ember-cli-eslint": "^3.0.0",
    "ember-cli-htmlbars": "^2.0.1",
    "ember-cli-htmlbars-inline-precompile": "^0.4.3",
    "ember-cli-inject-live-reload": "^1.4.1",
    "ember-cli-less": "^1.5.4",
    "ember-cli-qunit": "^4.0.0",
    "ember-cli-shims": "^1.1.0",
    "ember-cli-sri": "^2.1.0",
    "ember-cli-uglify": "^1.2.0",
    "ember-data": "~2.14.3",
    "ember-export-application-global": "^2.0.0",
    "ember-load-initializers": "^1.0.0",
    "ember-resolver": "^4.0.0",
    "ember-source": "~2.14.1",
    "ember-welcome-page": "^3.0.0",
    "loader.js": "^4.2.3"
  },
  "engines": {
    "node": "^4.5 || 6.* || >= 7.*"
  },
  "private": true
}