KB4577015 breaks parts of MMC

Looks like typical Microsoft introduced a new GPO option in the Security tab, and it breaks part of MMC. Theres a workaround that involves deleting the regkey and readding it once a hotpatch comes out. We experienced this error and caused a fair amount of confusion. Hopefully it saves one of you guys from a panic attack.



Thanks for sharing that - it does look like an annoying bug. For anyone who is rolling out the regkey workaround that should be pretty straightforward as a worklet. Here’s an example of a worklet that modifies a regkey:

but you’d used Remove-ItemProperty instead of New-ItemProperty: