you could check the following: # NK{]H$fd
ze+S_{
- if the surface/element tilt is too large _Co
v >6_i
us8ce+
- enough analysis rays used? \Ff]}4
(Ze\<Y#cv
- have you used Coherent Data option under Detector setting. [m
x}n+~
REX/:sB<
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.