I've deleted just about all of the cookies and it worked just now.... But i'm going to wait and see......
UPDATE!!!!!!!!
Finished the Panelling down one side of the ship and decided to try mirrring it on the other side.
I thought it looked rather good so i've stayed with that.
p.s. I've not removed the hatches on the side, i've just forgotten to do them b4 i did the render lol