Windows Stardew Valley Flashing On & Off

Dar

Cowpoke
I am playing on a PC with Windows 10 in English. I access Stardew Valley through Steam. A few days ago, when I tried to log into SV, my game screen started flashing on & off like a strobe light with the flashing screen alternating between Stardew Valley & my wallpaper. The only way I can stop the flashing is by signing out through task master. I thought that maybe I would see some notice of it somewhere in discussions or on the ConcernedApe webpage, but have not. Help, please. (PS I do not have this problem with any other program on my PC.)
 
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