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Date: Sun, 7 May 2017 18:38:44 +0200 (CEST)
From: Wojciech Puchar <wojtek@puchar.net>
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To: ports@freebsd.org
Subject: need help with upgrade of virtualbox-ose
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from 5.0.26 to 5.1.latest.

every attempt ends with virtual machine crash just when it should switch 
from windows loading screen to normal screen. all VMs are windows 7 pro.

Logs doesn't give any hint.

Any help?