Whilst i was messing around with the Whirlwind skin (as you do) i managed to get this crazy effect.
http://i23.photobucket.com/albums/b357/ ... c00052.jpg
All i was trying to do was fix the colour of the skulls on the side of the launcher tubes to gold, i cleared the path for them through the dirt and colour layers and then........bam.
As you can see the launcher and the targeting array both became borked. I have seen pixel clash before but not this...any idea whats causing it