you could check the following: oba*w;
=wj~6:Bf
- if the surface/element tilt is too large Un/fP1
{;4PP463
- enough analysis rays used? _#gsR"FZ$
DO\EB6xH>%
- have you used Coherent Data option under Detector setting. t~M<j|]k
9#(QS+q~
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.