Planets have a black line

[fmax]

When i see the planets or stars i can see that it have a black line from the north pole to the south pole, i change the textures but nothing happen, what i can do to remove this line?

[selden]

Please reread the User's FAQ in the Users forum or at
http://63.224.48.65/forum/viewtopic.php?t=2291

Items 1 and 2 apply.