Well if the game works fine w/o the maps then it's probably best not to use the old maps until a solution can be found at the moment..
Again, it could be something in the old maps that isn't reading correctly with the newest update?
( Modified the wrong message, oops- ) But you can try making a new FH folder and moving all the files there and seeing if that works?
Hopefully this'll be resolved soon and we can some answers though!