you could check the following: guYP|
EiC["M'}
- if the surface/element tilt is too large `Zo5!"'
nbP}a?XC
- enough analysis rays used? uKXU.u*C
aC1 xt(
- have you used Coherent Data option under Detector setting. @q<h.#9
nt|n[-}
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.