> I'm sorry, I know similar questions have been posted before, but I > cannot seem to find my way around this issue: when I use fceux's > fullscreen option, a black square occupies part of the upper left corner > of the screen. [...]
Are you running dwm 6.0 or hg tip? If you're running 6.0 could you try hg tip and see if the problem persists? -- Eckehard Berns