I made the terrain in sai, all in greyscale (not greyscale mode, no option.) at 200x200. After I noticed my error I resized both the terrain and the mask to 513x513. The mask works completely fine.
I installed GIMP and converted it to greyscale mode. Saved it, overwrite the file, opened FH and still crashes.
The game freezes for about 3 seconds then closes itself; no error or anything.
I have no idea what I'm doing wrong