Occasionally when rebooting my machine, VirtualBox would fail to start up correctly. They changed the command to restart it once moving to OS X Mavericks, so I’m just recording here the new command:
[bash]
sudo /Library/Application Support/VirtualBox/LaunchDaemons/VirtualBoxStartup.sh restart
[/bash]
I made a command in my local ~/bin/ directly called ~/bin/virtualbox_restart so I could easily restart if needed.
Justin Carmony 