mitchellh/vagrant — pull request #2586 by tmatilai (2013-12-05 03:36:36+00:00)
Title: Add missing argument to ProviderVirtualBox::SyncedFolder#driver call

GH-2577 missed passing the `machine` to the `driver` method.

I'm also having other issues with synced folder with both VirtualBox and Fusion providers, but it's getting too late tonight for me to debug if it's because of a plugin or Vagrant itself...