Hi folks, I'm running into a couple of strange issues with a NetBoot image created from macOS 10.12.6 (16G1408).
The first is that Disk Utility can't erase a disk. I keep getting errors when I try it.

When I boot the Mac with a USB boot disk, I can use Disk Utility normally. I have tried this now on three computers, and I get the same behavior.
Second, if I NetBoot the computer again to image it, Casper Imaging starts its process but crashes with either of the following messages if the "Erase drive" option is checked:

I first created a base OS dmg using AutoDMG 1.8.1, as I normally do. Then, I created the NBI from that using AutoCasperNBI 1.4.1. I didn't get any errors when I performed either of those steps, so as far as I know, the NBI was created successfully.
Has anyone seen this issue before with any previous version of macOS and the image creation tools?

