you could check the following: vi]cl=S
hE7rnn{
- if the surface/element tilt is too large SN]Na<P
hjz`0AS
- enough analysis rays used? <B!DwMk;.
X/h|;C*9
- have you used Coherent Data option under Detector setting. ;Irn{O
[Pl''[
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.