[Serpiko]

When I try 256x512 I get two images, squashed, on the left side and none on the right side. This was tried on the Spitfire Mark IXe.

I am surprised that you even get a noseart (although deformed) on a Spit! Spits aren't supposed to allow nosearts, unless you have a mod for it. If so, the error could depend on the mod.

Try it on a Mustang, or P-47, or P-38 (you should select USA insignas to enable nosearts slot) and let me know.