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My standard workflow for a couple years now has involved using a Debian 8 64-bit VM with Guest Additions on my Windows 8.1 64-bit host and essentially treating it as a terminal emulator, then using my host machine for everything else. I typically have the VM fullscreened and use alt+tab extensively for switching between it and my host.

After I upgraded VirtualBox on Friday to 5.1.18, I am no longer able to alt+tab away from my VM, whether in fullscreened, windowed, or in seamless mode. I can confirm that the host key is working fine and that the problem is not that the keyboard is being unexpectedly captured. Even more bizarre, I also encounter the problem on my 32-bit Debian VM and my Ubuntu 16.04 64-bit VM, but not on my Windows 7 (32-bit) or 10 (64-bit) VMs.

Any ideas?

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  • If you downgrade to the version you were using does the functionality return?
    – Ramhound
    Apr 17, 2017 at 21:11
  • I haven't attempted that yet; I was hoping it wouldn't be necessary.
    – Hamms
    Apr 17, 2017 at 21:12
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    It might not be required but it's the only way to confirm the problem is with the hypervisor software and not the VM itself
    – Ramhound
    Apr 17, 2017 at 22:08
  • Given that the change happened immediately after upgrading VirtualBox and after no changes had been made to the VM, and that the problem manifested on multiple different virtual machines simultaneously, blaming the hypervisor software seems like a pretty reasonable assumption. That being said, I can attempt to downgrade later today just to be 100% certain
    – Hamms
    Apr 17, 2017 at 22:27
  • @Ramhound downgrading to 5.0.36 appears to have fixed my issue. That being said, I'd still like to figure out what was going wrong so I don't have to remain on this version of VB indefinitely
    – Hamms
    Apr 18, 2017 at 17:58

1 Answer 1

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Downgrading to 4.3.40 seems to have resolved the error, but still does not explain its nature.

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