REPAINT PROBLEM

Hi i am trying to change the REGISTRATION on a Virgin atlantic 747 but keep getting funny textures at night. It looks

like part of the repaint at night is showing day textures, and the lights dont match against the body of the aircraft.

1) I first converted the DDS file into a format in which i could edit it in photoshop.

2) I then changed the reg and saved it as a DDS file using the plugin from photostop.

Am i missing anything.

Kind Regards Chris Harwood