Odd seams in my skybox

When testing out my new skybox I get weird seams in some of the corners. I put my textures in fireworks and confirmed it’s not a problem with the images themselves. Does anyone know a way to fix this?

http://cid-151851e0a027f0bd.office.live.com/self.aspx/.Public/example.png

All textures that are single images and not surface structures or similar (i.e., not mapped more than once onto a single surface, as opposed to, say, a brick texture on a wall) need their WrapMode set to “Clamp” insted of “Repeat” in the import settings. Otherwise you’ll get interpolation errors along the outer rim of the texture, mirroring pixels of the opposing edges.