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But this is the error which I get (sometimes, after 5-6 days) when I try to restore old snapshot of a running VM. So, I can't restore snapshot and get running VM because I must discard "saved state", and that's how my snapshot became snapshot of unexpectedly powered off VM, which is not wh...

That is not a solution for snapshot. I have identical problem with VirtualBox 4.2.10 r84104 I did a snapshot of running VM, and after some time (couple of days) I cannot start that snapshot. That is a BIG problem for me, because I need exactly running state! This is not first time that this problem ...