Create Snapshot break VirtualMachine (lost snapshot or lost entire Virtual machine)

[Antimo Di Comite]

Hi have a Virtual Machine with two snapshot. It work fine but whenever i create snaphost / save state / restore snapshot randomly it stop working. Some times i found the .vbox file corrupted i.e <HardDisks/> tag is as i write empty with no data , but the snapshot are fully described. Last time i create a snapshot, restore a state and similar operation (2 or three operation for testing purpose) and the GUI show that the machine was "inaccesible". Restart the gui i see that i lost the last Snapshot (this time the <HardDisks> tag is not empty). I attach the vbox.log , and i have backup the machine so i can recreate the problem if it could be usefull to help to found a solution.

Thank you