NO RESPONSE from Escape, Backspace, and other keys with VirtualBox on Windows 10 host

[qd01a]

I created a Windows XP-SP3 32-bit guest (extension pack installed) running under VirtualBox 5.0.22 on a 64-bit Windows 10 host. Everything seemed to work perfectly, except some keys such as backspace and escape, among a few others, exhibited no response. If I VNC'd into the VM, however, those keys worked fine. I copied the VM's VDI file onto a 64-bit Windows 7 desktop also running VirtualBox 5.0.22, and all keys worked perfectly. As such, it seems this may be another issue revolving around Windows 10. Host and guest were all set to standard U.S. English Keyboard, so this is not an internationalization issue.