On Mon, 11 Sep 2023 14:10:31 -0700
John Jason Jordan <joh...@gmx.com> dijo:

>On Mon, 11 Sep 2023 13:37:15 -0700
>wes <p...@the-wes.com> dijo:
>
>>On Mon, Sep 11, 2023 at 1:32 PM John Jason Jordan <joh...@gmx.com>
>>wrote:  
>>> Normally release is done with the Right-Ctrl key, but if you're in
>>> the host and the guest has exclusive control of mouse and keyboard,
>>> you have no Right-Ctrl key  
>
>>something is not right here. there should never be a case where the
>>virtualbox guest can prevent virtualbox from acting on the "host key"
>>(right-ctrl by default, as you noted). I don't have any specific
>>suggestions at this point, but I would encourage you to peruse through
>>the settings related to this to see if anything sticks out.  
>
>I currently have three other virtual machines (all Windows), and in the
>past I have had numerous others. I have never had this happen before,
>so my guess is that you are right, 'something is not right here.' I
>will poke at this more later today. 

OK, I have more information, although I don't have a fix. I thought the
problem had just disappeared, but today it happened again. And while
things were locked up I spent an hour trying different things to see if
I could repair whatever was wrong. One of the things I discovered was
that all running programs were still working, e.g., I was downloading a
distro by qBittorrent, whose window was still on the screen, and I
suddenly noticed numbers shifting as the download continued. In
qBittorrent I tried moving around inside the window with the tab key,
moving to different buttons to click on and it worked, except clicking
failed. Eventually I discovered that the keyboard was fully functional
unless I tried to minimize or maximize a window, or start or stop a
program, or get to a terminal. The mouse cursor was working fine, but
no clicks were possible with any of the keys or scroll wheel. At the
end I came to the conclusion that what had gone wrong was that the
window manager had been killed. On the net via my phone I read about
key commands to restart the window manager, but none of them worked.

I also discovered that it only happens when I minimize the window that
is holding the Debian guest OS. I hadn't done this for a couple days,
which is why I thought that the problem was resolved, but today I did it
again, and sure enough, instantly I had no window manager. And since I
never found a solution I'm still stuck using the power button. 

Well, at least I've made some progress. And now I can easily replicate
the problem for testing purposes. 

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