title: /vagrant not populated with files
body: <p>I have Vagrant (1.7.4) configured with the default configuration from <code>vagrant init</code> using the latest version of VirtualBox (5.0.16 r105871) on OS X (10.11.4) and the latest <code>ubuntu/trusty64</code> box version (v20160323.0.0). </p>
  
  <p>My VM has the matching version of guest additions, but I can't seem to get the shared <code>/vagrant</code> directory to work. The <code>/vagrant/</code> directory exists on the VM, but if I run <code>ls</code> on it it's completely empty. If I <code>touch</code> a file it appears on the guest in <code>/vagrant</code> but does not sync back to the project folder on my machine, and disappears on reboot. The VirtualBox GUI shows the shared folder:</p>
  
  <p><a href="http://i.imgur.com/yM1wuj5.png" rel="noreferrer">http://i.imgur.com/yM1wuj5.png</a></p>
  
  <p>EDIT: Vagrantfile:</p>
  
  <pre><code># -*- mode: ruby -*-
  # vi: set ft=ruby :
  
  # All Vagrant configuration is done below. The "2" in Vagrant.configure
  # configures the configuration version (we support older styles for
  # backwards compatibility). Please don't change it unless you know what
  # you're doing.
  Vagrant.configure(2) do |config|
    # The most common configuration options are documented and commented below.
    # For a complete reference, please see the online documentation at
    # https://docs.vagrantup.com.
  
    # Every Vagrant development environment requires a box. You can search for
    # boxes at https://atlas.hashicorp.com/search.
    config.vm.box = "ubuntu/trusty64"
  
    # Disable automatic box update checking. If you disable this, then
    # boxes will only be checked for updates when the user runs
    # `vagrant box outdated`. This is not recommended.
    # config.vm.box_check_update = false
  
    # Create a forwarded port mapping which allows access to a specific port
    # within the machine from a port on the host machine. In the example below,
    # accessing "localhost:8080" will access port 80 on the guest machine.
    # config.vm.network "forwarded_port", guest: 80, host: 8080
  
    # Create a private network, which allows host-only access to the machine
    # using a specific IP.
    # config.vm.network "private_network", ip: "192.168.33.10"
  
    # Create a public network, which generally matched to bridged network.
    # Bridged networks make the machine appear as another physical device on 
    # your network.
    # config.vm.network "public_network"
  
    # Share an additional folder to the guest VM. The first argument is
    # the path on the host to the actual folder. The second argument is
    # the path on the guest to mount the folder. And the optional third
    # argument is a set of non-required options.
    # config.vm.synced_folder "../data", "/vagrant_data"
  
    # Provider-specific configuration so you can fine-tune various
    # backing providers for Vagrant. These expose provider-specific options.
    # Example for VirtualBox:
    #
    # config.vm.provider "virtualbox" do |vb|
    #   # Display the VirtualBox GUI when booting the machine
    #   vb.gui = true
    #
    #   # Customize the amount of memory on the VM:
    #   vb.memory = "1024"
    # end
    #
    # View the documentation for the provider you are using for more
    # information on available options.
  
    # Define a Vagrant Push strategy for pushing to Atlas. Other push strategies
    # such as FTP and Heroku are also available. See the documentation at
    # https://docs.vagrantup.com/v2/push/atlas.html for more information.
    # config.push.define "atlas" do |push|
    #   push.app = "YOUR_ATLAS_USERNAME/YOUR_APPLICATION_NAME"
    # end
  
    # Enable provisioning with a shell script. Additional provisioners such as
    # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
    # documentation for more information about their specific syntax and use.
    # config.vm.provision "shell", inline: &lt;&lt;-SHELL
    #   sudo apt-get update
    #   sudo apt-get install -y apache2
    # SHELL
  end
  </code></pre>