|1||1||4.3.18 does not fix anything for me. Same as above, same as the jandesen issue plus more info - I started 3 VMs in parallel (after upgrading and rebooting) - just fine. As soon as I shut one of them off - no other VM could be started, even though the other 2 were still running. It does not matter which guest OS is shut. As soon as you shut one - can't start another. THat was the same before as well. Oh, this just in - they can't be shut down fully either. As soon as the issue appears - shutdown never finishes (linux, windows guests) - can't even use the close button of the guest OS and have to reboot the host by force.