Screen goes blank after idle time

[aforren1]

After waiting a few seconds, the psychtoolbox window goes black (then white?). The loop it executes starts at line 87 in main. I'm not touching the screen at that point, so not entirely sure what's happening.

[aforren1]

Can't reproduce easily on linux + non-fullscreen, will try on windows...

win = Screen('OpenWindow', 0, [0 0 0 0], [0 0 600 600]);
Screen('FillRect', win, [0 255 0]);
Screen('Flip', win);
...