I noticed that the OSD window (at least under Windows 10) is always visible when Alt-Tabbing, even it's not shown on the screen already.
Is it possible to hide it from the list of visible windows?
Besides, it breaks full screen exclusive mode of madVR video renderer - it thinks that some application draws foreground window and never switches to exclusive mode.
Perhaps, it's better to close OSD when it's not shown?
And if I close this window by hand, OSD will be never shown again.