Ok, so I'm having trouble with some mountains I made to go as a background in the sky. I edited the Mygeeto mountains in the GIMP, and I made sure the background was the transparant checkered color.

My next step is loading the picture into the editor that automatically comes with the targa images and resaving it. (this is the only way i found it possible to have it in-game, error-free.)

Then, in-game, the transparancy gets messed up and turns to complete white.

Is there any way around this?

I'm not sure what this other editor is, but it's obviously messing up your transparency, probably deleting your alpha layer or something. Good thing is, you can do everything you need to get that alpha-layered background done in GIMP. Please describe why you think you need to load it in some other program (so you can get it in "error-free").

Originally, before I had the GIMP, in order to edit an image, I would right-click on it and scroll down to edit with the Nero Photosnap Veiwer. (Doesn't this program automatically come with the BF2 modtools? Cause I don't remember ever having it.)

Anyways, when I would try saving a texture or something with the GIMP, it would save, but there would be errors like the texture becoming completely one color, or a strip of the color would appear with the outside being freaky colors.

I got very frustrated by this, but when I started to mess around, I opened the GIMP modified image with Nero, then resave it as something new, and no more errors. But then I tried using a transparancy with this and it wouldn't work.