it says i can't open the file because i'm using the version 173 and it was made in a 175 version... But the 173 version is the last one isn't it?
EDIT - I got it to work, thanks! But still, if I keep running quickly from one black area to another, right next to their borders, it kind of bugs...
Sometimes the area I enter gets black, sometimes the area I leave gets visible... Isn't there a simpler way to do this?