this seems to be a new bug, seen a few posts but no solutions. you can try updating video driver. try changing the renderer to software only, thats in the menu "project settings". along with the unchecking of the second monitor in playback preferences, make sure the wrench tool icon menu on the program panel has enable transmit unchecked. do you have any third party plugins or hardware premiere uses? does this happen instantly or just every so often? computer specs, win/mac, hardware etc.
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