you could check the following: >uZc#Zt
%m6qL
- if the surface/element tilt is too large 8zMGpY#
[H\0
'
- enough analysis rays used? jjH2!R]^>
TqN@l\
- have you used Coherent Data option under Detector setting. J1(SL~e],
1:<n(?5JI
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.