TightVNC Shows black screen after Win 10 updates

Hello,

Suddenly, after applying the latest Windows 10 updates to a headless machine
used for BOINC crunching, I am getting a black screen when I try to remote
into it from another machine using TightVNC.

I've tried completely uninstalling and re-installing TightVNC server on it
so it's at it's most current release.  I've also tried fiddling with a lot
of its options and with the Win 10 desktop "personalizations" as well
(including the resolution) and none of it has any effect.

Here's the strange thing - when I attach a real monitor to it, I can remote
into it and I can see the desktop just fine. When I remove the real monitor,
the remote session goes black.

I don't know what's changed and I don't know what else to do.

Any ideas?  If you need any specifics about my machine or TightVNC's
settings, just let me know.

Thanks.



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