My Vagrant 1.7.2 machine bugged out and when I tried to `vagrant up` it spawned a new box instead of bringing up my existing machine. Naturally this was a problem because I had made some manual changes to the config that I hadn't had a chance to persist to my puppet config files yet. To fix the problem I found used the command ` VBoxManage list vms ` in the directory where my Vagrantfile is. This provided me a list of the machine images it could find. I then went and edited the file at .vagrant/machines/default/virtualbox/id and replaced the UUID that was in there with the one that the VBoxManage command had output. Now when I run 'vagrant up' it spins up the correct VM. Happy days.