So while I am editing, my screen turnes black randomly throughout my timeline. This started happening when i started adding green screen effects to my video using ultra key.Yes i have done the project settings to general and that did not work. I also have tried the sequence option of render in and out, render selection, and render audio. I have also tried Window - Workspace - Reset to saved layout. I have tried restarting the application, UNINSTALLING THE APPLICATION, Use hardware acceleration when available on google, and even deleting the video clips and putting them back together and NOTHING has worked. Someone PLEASE help me.