need help with upgrade of virtualbox-ose

Wojciech Puchar wojtek at
Sun May 7 17:23:25 UTC 2017

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?

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