On a Windows Server 2012 box, I'm using PS to create a new IIS User (for automated deployments using MSDeploy). The command itself appears to work fine -- the user is created -- but as soon as I exit my PowerShell session (typing exit or just closing the command window), a dialog is displayed stating "powershell has stopped working", with the following details:

Problem signature:
  Problem Event Name:   PowerShell
  NameOfExe:    powershell.exe
  FileVersionOfSystemManagementAutomation:  6.2.9200.16628
  InnermostExceptionType:   Runtime.InteropServices.InvalidComObject
  OutermostExceptionType:   Runtime.InteropServices.InvalidComObject
  DeepestPowerShellFrame:   unknown
  DeepestFrame: System.StubHelpers.StubHelpers.GetCOMIPFromRCW
  ThreadName:   unknown
  OS Version:   6.2.9200.2.0.0.400.8
  Locale ID:    1033

The PS commands in question are:

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Web.Management")
[Microsoft.Web.Management.Server.ManagementAuthentication]::CreateUser("Foo", "Bar")

Why is this happening and how can I avoid it?

EDIT: I've also confirmed this be a problem with PowerShell 4.0, so I've added that tag. I've also submitted it on Connect.

UPDATE: It appears that Windows Server 2012 R2 does not have this same bug.