Map bug i am having...

Ever since i tryed a higher resolution, the maphack does not show monsters, and when i dont have maphack turned on even the normap map has a bug. It does not show any other players even inside a town, and there is a black + burned near the stash. It is weird, why has it happened that now my map does not function, i can unserstand if it is something to stop maphack, but this bug happens even when it is not on. I even have restarted my PC, still players do not show on my map, and monsters do not show when i have maphack turned on, and there is a black cross (like a player cross) stuck above the stash all the time.

please help, the map is very important in this game.