I used my digital Windows 10 Disk and then went through the repair process. It could not repair and then I rebooted without any need for Windows 10 Disk and chose
option F1 debugging.
It then rolled back the previous 2018-01 *Cumulative Update for Windows 10 Version 1709 for x86-based Systems (KB4056892)*and I was presented with the logon screen to sign back-in.
If you want to block this package file until Microsoft come up with a solution, simply download 'wushowhide' *Troubleshooting Pack Cabinet (.diagcab)*and this will stop its startup process.
You may download for free Here
If users go to Here and download the Microsoft Update Standalone Package (.msu), the file is downloaded whilst the user is in Windows and after reboot again, one is locked out with the startup blue logo
'hanging'. Microsoft were not aware of this anomaly at the time but I have now reported it to the technical dept and developers will offer a 'fix' after they have repaired the problem.
I have also reported it to the feedback hub app that resides on ones OS PC.