ok, I think you don t see the problem with reflection but it s normal, I don t explain very well what is the problem
  I say bad reflection but the reflection works 
 but 
 do that : 
 compare the glass reflection of the model that I sent to you with the glass reflection of g1_i_mask03 (the original model) 
 you will see the difference 
 the original model (g1_i_mask03) reflect light on glass as if glass is bent (convex - i am not english, I hope you understand) 
 the modified model reflect light on glass as if glass is flat 
 good reflection - original model  
http://module5.free.fr/mask7.jpg) 
 there is a small band of reflected light on black glass 
 ------------------------------------------------------------------------- 
 bad reflection - new model - when no light on glass  
http://module5.free.fr/mask5.jpg) 
 bad reflection - new model - when light on glass  
http://module5.free.fr/mask6.jpg) 
 the light is reflected on all the glass
 it looks like the glass is flat 
 I think you see the difference now but how can we fix that :confused:
 I don t know but perhaps it is not a small problem :(
 I hope i m not right ;)