Sergiy Tkachenko
Results
3
comments of
Sergiy Tkachenko
https://stackoverflow.com/questions/357076/best-way-to-hide-a-window-from-the-alt-tab-program-switcher
Similar issue with Windows 10 update 1809, but instead of checking new mail I see black square. I think M$ just something changed in .NET Framework :)
with KB4480056 still black square in thumbnails