Feral Heart

I have looked through the Help section for this problem but I cant seem to find any topics about it.

I have been working on this map for awhile, it is almost done so I decided to export it with another map to see if the map worked properly, but then when I shut down FH to bring up a new window, when it reaches the title screen of FH, it suddenly crashes. I moved the map files (not the export ones, just the map ones) and then re-downloaded the game, and everything worked fine until I put the map files back in place... I exported another map before, with all the same items and textures, just different height map and stuff, so I wouldn't think the items have anything to do with it..
(I also kept all of the Object, Particle and Sky files that I had before.)

I don't want to have to remake the entire map, so I'd appreciate it if someone could help me figure out what the problem is.