Windows 10 Windows 10 - Start menu/search stopped working after 1903 upgrade

  • Thread starter Thread starter YairI
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YairI

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Recently had some disk issues, which were apparently fixed by "sfc" and "dism" (had to run multiple times, in safe mode etc.)
Not sure if Start menu worked after that, but I then upgraded to 1903, and did not have a restore point.
The Start menu stopped working since.

Every time I hit the start button and watch the task list, I see

- SearchUI starts and closes several times
- StartMenuExperienceHost starts and closes immediately.

Hitting she search icon opens momentarily the search window, which the closes by itself.

In the event log, I find crash reports on both:

Faulting application name: StartMenuExperienceHost.exe, version: 0.0.0.0, time stamp: 0x5d65fb6a
Faulting module name: MrmCoreR.dll, version: 10.0.18362.1, time stamp: 0x1cab1146
Exception code: 0xc0000006
Fault offset: 0x00000000000269a8
Faulting process id: 0xd30
Faulting application start time: 0x01d5dfe7bad82527
Faulting application path: C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
Faulting module path: C:\Windows\System32\MrmCoreR.dll
Report Id: 0f51b7ee-30e3-4b34-ac50-5e1c273ad520
Faulting package full name: Microsoft.Windows.StartMenuExperienceHost_10.0.18362.449_neutral_neutral_cw5n1h2txyewy
Faulting package-relative application ID: App

and:

Faulting application name: SearchUI.exe, version: 10.0.18362.418, time stamp: 0x5d995690
Faulting module name: MrmCoreR.dll, version: 10.0.18362.1, time stamp: 0x1cab1146
Exception code: 0xc0000006
Fault offset: 0x00000000000269a8
Faulting process id: 0x1828
Faulting application start time: 0x01d5dfe7b9695e65
Faulting application path: C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
Faulting module path: C:\Windows\System32\MrmCoreR.dll
Report Id: b8eb4af2-6766-4e01-baa4-de07f6e00a41
Faulting package full name: Microsoft.Windows.Cortana_1.13.0.18362_neutral_neutral_cw5n1h2txyewy
Faulting package-relative application ID: CortanaUI

Tried the following - all resulting in identical results:
- Boot in safe mode
- Create another account and use that one
- Create the Admin account
- Revert to "clean boot" (no startup processes, minimum services started)
- Run sfc /scannow (no errors , few warnings)
- Run "dism scanhealth" and "dism restorehealth"
- Re-registered the cortana app with "Get-AppXPackage -Register" command
- Re-run the 1903 upgrade
- Reverted to the prev 1903 upgrade
- Typing "Cortana" in "Settings" windows shows the search options
- In PowerShell - used "Set-WindowsSearchSetting" and toyed with the parameters - no errors (with "-debug")

ProcessMonitor shows a lot of activity for both processes before it's terminated - cannot tell what's casing it to close.

Other than I clean install (which I'm reluctant to do) - any other idea?
What's common to SearchUI and StarteMenuExperienceHost that both use MrmCoreR.dll?
What the function of MrmCoreR.dll (it only has a limited number of exported functions) ?

YairI

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