From owner-freebsd-emulation@FreeBSD.ORG  Mon Jan 30 08:26:52 2012
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Date: Mon, 30 Jan 2012 00:26:50 -0800
From: Yuri <yuri@rawbw.com>
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Subject: VBox: "Unsupported version 2 of data unit" after snapshot was
	restored
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After I restored the snapshot (of Windows 7 guest) I get such error 
while launching the machine again:
"Unsupported version 2 of data unit '8237A" (instance #0, pass 0xffffffff)
(VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION)

I am not sure if this is FreeBSD specific or generic.

FreeBSD-9.0-STABLE amd64
virtualbox-ose-4.0.14

Yuri