I get a blank screen, but here is the result from the error log. It appears to be pre-pending everything with /tmp/build_xxxx...
both dev & prod work fine locally.
Code is here... https://github.com/TransformCore/dial-tone-frontend
2014-11-25T14:43:27.388147+00:00 heroku[router]: at=info method=GET path="/css/bootstrap.css" host=dial-tone-frontend.herokuapp.com request_id=1bdcc1f4-4d8b-42b0-a85d-8b265d2665bd fwd="80.5.64.178" dyno=web.1 connect=1ms service=8ms status=500 bytes=208 2014-11-25T14:43:27.388931+00:00 app[web.1]: [2014-11-25 14:43:27] request.CRITICAL: Uncaught PHP Exception InvalidArgumentException: "The file "/tmp/build_23552b1c8333d8e8b9b475444451531c/app/config/routing.yml" does not exist." at /app/app/cache/prod/classes.php line 1575 {"exception":"[object] (InvalidArgumentException: The file \"/tmp/build_23552b1c8333d8e8b9b475444451531c/app/config/routing.yml\" does not exist. at /app/app/cache/prod/classes.php:1575)"} [] 2014-11-25T14:43:27.390315+00:00 app[web.1]: [25-Nov-2014 14:43:27 UTC] PHP Fatal error: Uncaught exception 'InvalidArgumentException' with message 'The file "/tmp/build_23552b1c8333d8e8b9b475444451531c/app/config/routing.yml" does not exist.' in /app/app/cache/prod/classes.php:1575 2014-11-25T14:43:27.390355+00:00 app[web.1]: Stack trace: 2014-11-25T14:43:27.390525+00:00 app[web.1]: #0 /app/app/cache/prod/classes.php(2301): Symfony\Component\Config\FileLocator->locate('/tmp/build_2355...', NULL, true) 2014-11-25T14:43:27.390779+00:00 app[web.1]: #1 /app/vendor/symfony/symfony/src/Symfony/Component/Routing/Loader/YamlFileLoader.php(49): Symfony\Component\HttpKernel\Config\FileLocator->locate('/tmp/build_2355...') 2014-11-25T14:43:27.391220+00:00 app[web.1]: #3 /app/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php(58): Symfony\Component\Config\Loader\DelegatingLoader->load('/tmp/build_2355...', NULL) 2014-11-25T14:43:27.391369+00:00 app[web.1]: #4 /app/app/cache/prod/classes.php(1502): Symfony\Bundle\FrameworkBundle\Routing\DelegatingLoader->load('/tmp/build_2355...', NULL) 2014-11-25T14:43:27.391484+00:00 app[web.1]: #5 /app/app/cache/prod/classes.php( in /app/app/cache/prod/classes.php on line 1575 2014-11-25T14:43:27.391759+00:00 app[web.1]: 10.36.138.222 - - [25/Nov/2014:14:43:27 +0000] "GET /css/bootstrap.css HTTP/1.1" 500 - "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.36" 2014-11-25T14:43:27.389956+00:00 app[web.1]: [2014-11-25 14:43:27] request.CRITICAL: Exception thrown when handling an exception (Twig_Error_Loader: The "/tmp/build_23552b1c8333d8e8b9b475444451531c/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/views" directory does not exist.) {"exception":"[object] (InvalidArgumentException: The file \"/tmp/build_23552b1c8333d8e8b9b475444451531c/app/config/routing.yml\" does not exist. at /app/app/cache/prod/classes.php:1575)"} [] 2014-11-25T14:43:27.390994+00:00 app[web.1]: #2 /app/vendor/symfony/symfony/src/Symfony/Component/Config/Loader/DelegatingLoader.php(45): Symfony\Component\Routing\Loader\YamlFileLoader->load('/tmp/build_2355...', NULL)
heroku push master
or whatever will tell you exactly which bundles are installed. It seems like some are missing. You can go through the output and your composer.json and make sure they are all there. – Sehael