glitch in the normal preview

[kingcrimsonster]

I did not talk about color control. In this case, two separate windows open. Please try check "No Avisynth during Preview:" and press "Normal preview" button. Try preview this with the Full HD or UHD file. You will see one window in full screen, its edges go beyond the screen. You can exit this mode only by pressing "ESC". The window closes, but the sound continues to go. In the task manager, you can see the process and close it.
Normal Preview should be: