dear Steve,

thanks for your great attention to details,

I can't evince anything from the information gathered by this
attempt. I wasn't sure it would lead anywhere in the first place, but
thought it was worth trying. Indeed the issue is tricky as the focus
should be switching from the guest to the host with the key
combo.... however thanks for follow up and for sticking to this
issue.. I am really curious and hope we'll find the reason for this
bug. Its a difficult challenge.

ciao