you could check the following: l]]l
"rAY.E]
- if the surface/element tilt is too large 9Mgq1Z
g(|6~}|o+
- enough analysis rays used? x[Wwq=~
4);)@&0Md~
- have you used Coherent Data option under Detector setting. -&e92g&n
u1c%T@w>Lz
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.