Running Virtualbox is now failing to run with the following error message
Failed to open a session for the virtual machine JKMacWin7.
Could not open the medium '/Users/Jonathan/VirtualBox VMs/JKMacWin7/JKMacWin7.vdi'.
VD: error VERR_FILE_NOT_FOUND opening image file '/Users/Jonathan/VirtualBox VMs/JKMacWin7/JKMacWin7.vdi' (VERR_FILE_NOT_FOUND).
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Medium
Interface: IMedium {29989373-b111-4654-8493-2e1176cba890}