Height Map/Terrain Issues

[Imara]

Yeah, I've had this problem for a LONG while XD
When I put the name in for the height map, the window for FeralHeart closes/crashes.. And.. Yeah
-It was grayscaled
-It was a PNG file
-It was 513x513

Also, it was saved in..
FeralHeart>Media>Terrains

And, if you must, here is the (fail) height map XD
http://i51BannedImageSite/1olqua.png

I don't see why it's crashing?..

[Ruby1234]

Requirements:
513x513
Grayscale
Is now, and was always one layer

Things to try:
Switch the format to something else, then back.
Copy the image, close out the image so the image program is blank, and paste it in, then flatten it, and save it.
Switch it from Grayscale to RGB. then back to Grayscale.