The upload of my skybox does not work according to the instructions on Hifi docs. If the FTP protocol to be a problem? I get not an error message.
But there are problems with representation too.
I can not switch off the axis protection (View->Off axis protection). I think this is the reason, that you can see the edges.
The lighting does not like me. Below you can see a strong focused light, and above the sky is dark. I think a hemi light would be better.
Position of the skybox: 8192,8192,8192
The material is shadeless.
The normals are flips to inside.