Map Help, Heightmap makes game crash as soon as I use it

[Hawkwing]

Hi everyone... so, I read the map tutorials, and decided to try to make a map for one of my RPs. I had my heightmap done up, and when I went in-game to test it the game crashed. This happened before when I used MS paint, then I learned you could use anything but MS paint. So I downloaded GIMP v2.6.11, and used that to make my current heightmap. Game still crashed. I'm using grayscale, it's the right size (I used the watermill heightmap then completely made it one shade of grey), I saved it in terrains... any help as to what I'm doing wrong here?

[Nowe]

Flatten the layers or merge them

[Hawkwing]

When I saved it GIMP came up with a notice saying that befoer saving it should be merged. So I did, and the layers are merged

[CloudFish]

height maps should be

513x513
one layer
greyscale
no alpha channel (can be changed in gimp by right- clicking the image of your height map in the layers box)
png file

[Hawkwing]

I don't see a image of my heightmap in the layers box. Last time I opened it I did, but when I opened it just now it wasn't there

[Bloo.]

It should be there. In the layers box it should say Layer 1

[CloudFish]

[Hawkwing]

I figured it out, I had to select my terrain from a drop down box. Alpha channel was on, but I turned it off now, I'm on my way to test it. Thanks everyone who helped!


*Edit* It is working now! Thanks again!