Solved Invalid partition after FreeBSD installation

I have just installed FreeBSD 11.0-RELEASE i386 from a mini memstick image onto a disk where I had shrunk the Windows partition to create space for FreeBSD. The install seemed to go smoothly but on reboot I'm presented with
Invalid partition
Invalid partition
Invalid partition
No /boot/loader

FreeBSD/x86 boot
Default: 0:ad(0,a)/boot/kernel/kernel/
Invalid partition
No /boot/kernel/kernel/

I have previously installed FreeBSD on a disk with an existing Windows partition and that created a FreeBSD boot manager prompt, but not this time. Did I miss some option during the installation?
After doing a re-install and deleting the partitions that had been created previously, I am able to boot, although I get stuck at a mountroot prompt so maybe something got missed as part of the installation...