I see this also, though sometimes even in the live session, I do not see the black rectangle. When I do see it, holding the mouse over it seems to make it sometimes reappear until you move the mouse away. Also, I see the thin black strip you describe, even after booting into the installed system
I see this also, though sometimes even in the live session, I do not see the black rectangle. When I do see it, holding the mouse over it seems to make it sometimes reappear until you move the mouse away. Also, I see the thin black strip you describe, even after booting into the installed system