Check the Map has gone back to black and Solution for patch and disappearing maps topics. This procedure has been used to work around bugs more than it has for cheating.
Also, I can't think of a useful way to cheat with this. It will get you into a couple places you wouldn't otherwise be able to go (like those taken out of the game), but other than picking up a little bit of 'unreachable' loot, there is little benefit in using it to try to cheat.