Iohyve/bhyve VM not starting after reinstall; stuck at grub

Hi, I had to reinstall CORE 13.3 due to a boot disk problem and everything came up fine, except this VM (Debian with a few simple web services). It’s stuck at the grub prompt… any ideas?

[nils@freenas ~]$ iohyve list
Guest      VMM?  Running  rcboot?  Description
www-bhyve  NO    NO       YES      Sat Mar  4 16:29:47 CET 2017
[nils@freenas ~]$ sudo iohyve start www-bhyve
Starting www-bhyve... (Takes 15 seconds for FreeBSD guests)
[nils@freenas ~]$ sudo iohyve console www-bhyve
Starting console on www-bhyve...
~~. to escape console [uses cu(1) for console]
Connected

grub> ls
(host)
grub>
grub> ~
[EOT]
[nils@freenas ~]$ iohyve list
Guest      VMM?  Running  rcboot?  Description
www-bhyve  NO    NO       YES      Sat Mar  4 16:29:47 CET 2017

[nils@freenas ~]$ zfs list | grep iohyve
maindata/iohyve                                              134G  1.07T   140K  /mnt/maindata/iohyve
maindata/iohyve/Firmware                                    2.30M  1.07T   128K  /mnt/maindata/iohyve/Firmware
maindata/iohyve/Firmware/BHYVE_UEFI.fd                      1017K  1.07T   936K  /mnt/maindata/iohyve/Firmware/BHYVE_UEFI.fd
maindata/iohyve/Firmware/BHYVE_UEFI_CSM.fd                  1.02M  1.07T   959K  /mnt/maindata/iohyve/Firmware/BHYVE_UEFI_CSM.fd
maindata/iohyve/ISO                                          302K  1.07T   128K  /mnt/maindata/iohyve/ISO
maindata/iohyve/www-bhyve                                    134G  1.07T   128K  /mnt/maindata/iohyve/www-bhyve
maindata/iohyve/www-bhyve/disk0                              134G  1.09T  15.4G  -
maindata/iohyve/www-bhyve/disk0_dpim64_gui_clone0           81.4K  1.07T  7.68G  -
[nils@freenas ~]$