I installed this last week and the server failed to boot after initializing SMB. I then attempted to downgrade manually by moving the backup files back into place, but the web interface broke. I then manually reinstalled the new release, and it once again froze in the same place. Frustrated, I booted in safe mode and it worked! Turns out that DevPack was incompatible with the new kernel version. After uninstalling the server worked fine.
TLDR: Remove DevPack before upgrading, or your server won't boot.