VBox 4.2.6 crashes upon restoring an older state

[Urhixidur]

VBox 4.2.6 running on Ubuntu 12.04 64-bit, when I restored an older machine state, I was warned about losing the current state and chose to save the current state. This did occur, but the manager immediately crashed with the following message (French system):

L'accessibilité du média n'a pas pu être testée.

The object is not ready.

Code d'erreur : E_ACCESSDENIED (0x80070005) Composant : Medium Interface : IMedium {29989373-b111-4654-8493-2e1176cba890}

I restarted VirtualBox and launched the older state (which had been split off successfully) again, without any further problem.

[Urhixidur]

Log of the crash (at the end)

[frank]

Did you try to perform a snapshot merge while the VM was running?