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gpmc.msc via start -> type works just fine here

Does the same in my environment, it display the app but does not run, so I either right click Start and run, or launch from a console window

Yeah exactly, flipping me out, hope someone had the same and knows of a solution

GPO blocking mmc snapins ?

no, clean vanilla domain, few 2019 servers connected, administrative tools features installed. that's it. they do start from run, cmd, taskmgr, just don't do sh*t if you start > type the msc > click on it

broken search index maybe

anything other then .msc does start from there, so wouldn't expect that

no problems in my lab

I've just finally upgraded my home pc from W7 to W10 and powershell is not loading it just dissapears after a second, I've put it down to corruption which can't be repaired, buying a new HD tomorrow, also had random reboots with no bsod mind you and Ubuntu crashes too so I know it's hardware for sure

Do you do an in-place upgrade?

Nah - we've updated all the firmware's, and drivers and so on, checked cpu temperature , I believe the HD was generating errors which could not be repaired.