http://blogs.msdn.com/b/psssql/archive/2012/12/05/filenotfoundexception-with-microsoft-analysisservices-xmla.aspxI ran across two cases that were hitting the following Exception within SharePoint trying to run the PowerPivot Management Portal.&#160; This was located in the SharePoint ULS Log: EXCEPTION: System.IO.FileNotFoundException: Could not load file or assemblyen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/psssql/archive/2012/12/05/filenotfoundexception-with-microsoft-analysisservices-xmla.aspx#10374949Wed, 05 Dec 2012 19:17:13 GMT91d46819-8472-40ad-a661-2c78acb4018c:10374949Trevor Seward<p>Thank you for posting this. &nbsp;Quite the headache!</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10374949" width="1" height="1">