you could check the following: )}Mt'd
3_['[}
- if the surface/element tilt is too large pLFL6\{g
wz2)seZY
- enough analysis rays used? ;?[ +vf")
doUqUak
- have you used Coherent Data option under Detector setting. kA$;vbm
LHGK!zI
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.