I've seen that before. hehe
The last time I saw it was in blunder. Bad news in that case. I haven't opened the wings file back up yet, but upon opening the tga in gimp, there was no background coloring on it. It's like I saved it with the alpha channel dominant somehow. Weird thing is, by default, gimp doesn't open a file with the alpha present. You must manually add it, or add a layer to get the alpha present.I've seen that before. hehe
For that example, I used white simply to create my template with the faces outlined for for CS ease. I always hide the background in wings after I get my initial placement of parts to make it easier to see if any parts were missed. I never unhide after doing so.You have chosen a white background, to go with a mostly white model, not good unless you dhk. You also have chosen to hide the background in wings.