VirtualBox 5.1.20 has been released!
The installation on macOS Sierra and Oracle Linux 6 hosts went well and all seems to be working OK there.
I’m not 100% sure about the Windows 7 host though. The installation itself went fine, as did the installation of guest additions on a Linux VM running inside it. After a restart of the VM I attempted to do a yum update and the VM just seems to have died now. I can’t get more than a couple of commands out of it before it becomes unresponsive and has to be restarted. I think I’m going to have to remove and rebuild it. I don’t know if this was something I did, or something weird with VirtualBox.
That’s on my work PC and I’m not at work this week, so I was doing it over TeamViewer. I probably won’t have time to look at this again until next week. I’d be interested to know if anyone else has issues on Windows.