you could check the following: 4{g|$@s(
>KFJ1}b|3
- if the surface/element tilt is too large 2Qj)@&zKe#
c53`E U
- enough analysis rays used? hdL2`5RFF
0}V'\=F454
- have you used Coherent Data option under Detector setting. :
eFc.>KoD
+bnw,B><
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.