you could check the following: ljON_*
`{_PSzM
- if the surface/element tilt is too large +N@F,3yNa
&/?jMyD@
- enough analysis rays used? 0Wm-`ZA
tY=TY{ RY
- have you used Coherent Data option under Detector setting. 2f4c;YS
RZ%X1$
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.