you could check the following: fG 2)r
lU1SN/'zx
- if the surface/element tilt is too large r]e{~v/
LW=qX%o{
- enough analysis rays used? TXB!Y!RG#
(u?s@/e:`/
- have you used Coherent Data option under Detector setting. V
FM[-
ckX8eg!f
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.