I'm using the latest Moi v3 beta here. 
Could someone take a look at this screencast of me using the Inset tool and tell me where I'm going wrong please. 
 http://screencast.com/t/V5t3aLVS61v
The 3dm file is also attached.
 
Thanks for looking. 
Martin.
 
***EDIT*** 
As the issue is now in hand, this screencast has been deleted.  
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