Sep 07 2017 10:06 AM
Ok, long one guys.
I can recreate the situation on a windows 10 AzureAD joined machine (at least the several i tried): This is done manually via reg-edit removing the profile's UID in ProfileList, and the deleting the user profile directory. The next time that account ties to log on, you get the black screen with working start and "hidden" desktop as described above.
Troubleshooting: So we've ruled out graphics issues, it isn't the Win+P issue that was a thing during the insider previews pre-RTM, it appears to just be localized to AzureAD profiles (non administrator) that have been on the PC before and were logged in when one of the updates were applied and the PC restarts. Again this has only happened in less than 1% of updates across your networks (4 out of about 400).
The only way we can find to get past it is to do a soft or hard Windows reset and start from scratch. Obviously this turns a 15-20 minute profile reset into a 3 hour ordeal involving shipping the laptop back to this office.
And to sum up further details than I've described above:
Multiple hardware specs (Dell, Lenovo, HP)
All fully up to date Win 10
All on AzureAD domains with PIN requirements
Other local and AzureAD accounts work fine
Can replicate issue easily