Correct version of PowerShell
It seems that versions of the PowerShell v2 CTP are still being used and problems are being reported because the incorrect version of PowerShell is being used.
Tobias has a great post explaining which version you should be using and providing tools to check your PowerShell installation.
http://powershell.com/cs/blogs/tobias/archive/2010/01/24/are-you-using-the-correct-powershell-version.aspx
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