Also ensure you use the same version of VirtualBOX on both host, but not only VirtualBOX version, also the extension pack vesion... or at least the new host have a higher version, but never ever a lower version on any of thoose two.
Also ensure you use the same version of VirtualBOX on both host, but not only VirtualBOX version, also the extension pack vesion... or at least the new host have a higher version, but never ever a lower version on any of thoose two.