I've Recently Been Making Some New Lightsabers With Custom Textures.
  I Put The Files For The Sabers In My Override And Stared The Game...   
http://img167.imageshack.us/img167/3722/screenerrorzi6.th.jpg) (
http://img167.imageshack.us/my.php?image=screenerrorzi6.jpg) 
 THAT Is What I Saw! :O 
 What's Happening! 
 -DarthDingDong
  
 
  
  
    what exactly did you change? I need more information in order to help you out...
 a few key things..
 Did you save your edited image as a .tga file?
 Did you change the name of the texture file?
 Did you edit the .mdl file at any point?
 Did you include a .txi file?
  
 
  
  
    Did you save your edited image as a .tga file?
 Did you change the name of the texture file?
 Did you edit the .mdl file at any point?
 Did you include a .txi file?
 
 
 I Changed The Name Of My Custom Texture To w_lsabregold02
 
 Also I Hex Edited The .mdl File To Point To This Texture
 
 And Yes I Used A Txi File [w_lsabregold02.txi] Containing blending additive
 decal 1
 
 -DarthDingDong
  
 
  
  
    Well, I'm pretty out of practice, haven't modded this game in over a year, but if you did all of those things correctly, my guess would be that something is wrong with your alpha channel in your texture.
  
 
  
  
    Sorted Now
 
 -DarthDingDong