We've now had two instances where a Windows 10 1703 machine running E80.94 has failed to upgrade correctly to E81.10.
The package appears to deploy and install okay. Upon restart the pre-boot screen shows it is running E81.10 but then the OS loads, gets to the login screen and within a few seconds it blue screens with the error:
For the first machine, a laptop, I created recovery media for, stripped off FDE, and then performed a system restore to a previous point. I was then able to uninstall the Endpoint software and am in the process of patching the machine to 1809.
During the removal of Endpoint I observed that it was still running E80.94, which was the version shown on the recovery key, not E81.10. Perhaps this is the reason for the blue screen.
In any case I am about to investigate the second machine and will hopefully have the same workaround.
I can say I have successfully upgraded 150 machines to E81.10, with a further 103 awaiting upgrade from E80.94, so these are small numbers, thankfully.