After seeing the SEABIOS screen, Windows 7 x64 ends up in the screen asking to boot into safe mode or normal boot. Selecting any option eventually ends up looping back to this screen. Reverting back to the 20180607T005809Z version allows Windows 7 to boot again. WIndows 10 x64 guests do not have this problem.
Please see the joyent/smartos-live repo thread for more... https://github.com/joyent/smartos-live/issues/792
After seeing the SEABIOS screen, Windows 7 x64 ends up in the screen asking to boot into safe mode or normal boot. Selecting any option eventually ends up looping back to this screen. Reverting back to the 20180607T005809Z version allows Windows 7 to boot again. WIndows 10 x64 guests do not have this problem.