I definitely haven't manually deleted the file before (e.g., sudo rm vbox.cfg).
The path to the current installation went:
virtualbox-ose (Hardy) => upgrade to Intrepid => virtualbox (non-OSE version from virtualbox.org) => virtualbox-ose
Between virtualbox => virtualbox-ose appeared to be where the vbox.cfg file was lost.
I definitely haven't manually deleted the file before (e.g., sudo rm vbox.cfg).
The path to the current installation went:
virtualbox-ose (Hardy) => upgrade to Intrepid => virtualbox (non-OSE version from virtualbox.org) => virtualbox-ose
Between virtualbox => virtualbox-ose appeared to be where the vbox.cfg file was lost.