VirtualBox upgrade

[Marc Fournier]

Just upgraded Virtualbox to latest in ports, and when I try to start a machine, it gives me the following … read through /usr/ports/UPDATING, and see nothing there to indicate I needed to do something different with this upgrade then previous ones … ? 

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Oracle VM VirtualBox Headless Interface 4.2.6_OSE
(C) 2008-2013 Oracle Corporation
All rights reserved.

Error: failed to start machine. Error message: Could not find the VirtualBox Remote Desktop Extension library.
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Help?