Windows 10 1709 - wsappx process high cpu load & and black screen after login for some users

I had this problem and it now seems to be gone. I'm frankly not sure exactly what fixed it but I wanted to share my experience.

1. This is on a 5 year old HP desktop running Windows 10 Home with 2 accounts.
2. Resetting / uninstalling within Apps mostly just hung. I couldn't find a reset function for most of the apps anyway.
3. I tried the Get-AppxPackage -User ... | Remove-AppxPackage from a different user. As promised there were a lot of errors. This didn't help. In fact it somehow seemed to make it worse as now the other account that didn't originally have the problem also developed it.
4. I created a new Admin account and it too had the problem.
5. Tried the Get-AppxPackage ... on the other user account and it hung after a while.
6. Decided to check Windows Update. It claims KB4093112 was installed on 4/28 and also on 4/30. Also KB4093110 was installed on 4/28.
7. I ran System Restore. The most recent recovery point was before the 4/28 updates.
8. System wouldn't boot after the restore. I ran restore again with the same recovery point from the System Recovery menu and this time it booted.
9. Still had the problem!
10. Windows update still says all of the above were installed and also says KB4093112 failed to install on 5/1 (After the recovery). Don't know if this is normal for Windows Update to show the history of updates that were done after the restore point.
11. Rebooted a couple of times and the problem went away. Windows Update now says KB4093110 installed on 5/1. This appears to be the last event before things got back to normal. I am afraid that if it re-installs KB4093112 successfully the problem will come  back.

I also observed wsappx in Resource Monitor. It was consistently updating \programdata\microsoft\windows\apprepository\StateRepository-Machine.srd-wal. The last I looked before the problem went away the file was 900MB. Now with things back to normal it is 0 bytes.

Will post again if it come back.

We had to do exactly the same; any form of recovery offered by Dell reintroduced the issues: Recovery Partition, Recovery USB shipped by Dell Support.

Only when using older Windows 10 media would the Dell machines work properly.

Have two brand new surface pros showing these symptoms after a reboot 

Both domain joined, both updated completely

Tried all fixes, repairs etc

Extremely frustrating, spent 5 hours trying to troubleshoot them both with no results 

Disappointed Microsoft

Stop working on symptoms - I know what happened to all of us:

We took brandnew laptops from specific DELL, HP or Lenovo lots WITHOUT KNOWING that the factory-images do not have Security Update KB3074683 preinstalled.

Then all of us prepped the machine with a domain and a domain-user for the new employee. Before the colleague arrived and logged on the first time into his account, we installed and updated a store-app like Office. Doing that BEFORE the update mentioned above is installed, the domain-user-profile will be destroyed permanently.

All described in 

https://support.microsoft.com/en-us/help/3092053/apps-may-not-launch-on-a-windows-10-device-with-multiple-user-accounts

The non-permanent fix from Microsoft is not working for me, so I have to reinstall the machine. Before doing that I will try to delete the domain-user-profiles on the local machine and to rebuild them via domain-logon.

Cheers Philipp

Look at the user folder on the computer (C:\Users) and use that exact name. Sometimes if there's duplicates or sign in name has been changed, it can be different that expected.