you could check the following: q 376m-+
Q4#m\KK;i9
- if the surface/element tilt is too large ;"5&b!=t
?jv/TBZX4
- enough analysis rays used? &R'c.
O`IQ(,yef
- have you used Coherent Data option under Detector setting. P^~yzI
_^Ubs>d=*
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.