Trying out the brand new BizTalk 2013 Power Shell Provider (https://psbiztalk.codeplex.com/) I got this error:
Add-PSSnapin : Could not load file or assembly ‘System.Management.Automation, Version=184.108.40.206, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.
This happened after installing version 220.127.116.11 (the updated Power Shell Provider for BizTalk Server 2013) on top of version 18.104.22.168 on a Windows 2008 R2 server.
I bit of Goggling suggested that I installed the Windows Management Framework 3.0 (http://www.microsoft.com/en-us/download/details.aspx?id=34595) which I did and now everything works again.