Windows Server 2012 Powershell

I have been submitting a command in Window Server 2012 with Powershell v3.0:

Set-ItemProperty IIS:\AppPools\(AppPoolName) -Name managedRuntimeVersion -Value v4.0

This submits with no errors but it does not change the attribute/value. And it's not just this command if I submit the following command:

Set-ItemProperty IIS:\AppPools\(AppPoolName) -Name enable32bitapponwin64 -Value true

I get the same result, nothing changed and no errors.

Anybody seeing the same thing?