As the title says, having the key item "(any) treasure map" and clicking on it to see where it might be on the general map, it dissappears, making it very dificult to locate. It doesn't always do it, but I really don't know the conditions for it to stay on screen, as it looked completely random to me. It does not always happen, sometimes I'm able to have both the treasure map and the general map on my screen, but other times it just won't.