I’m strictly in sequential mode, but I’m not getting rays in the generated STEP file.All surfaces selected, Number of rays = 3Ray pattern = XY, Ray layer = 1, Lens layer = 0Wavelength = mid value,  all fields selected, configuration 1 is selected, tolerance = 1e-6File type = STEP, Parasolid set to V31 (current)System has zero vignetting, but no rays whether the Delete Vignetted box is checked or not. Surfaces as solids box is checked.Is 2026 R1 broken?  Help, anyone? 

Is Erin's guide (linked below) still the easiest method?  I've just learned about the new nesting feature, but that's not an option for Pro users.https://community.zemax.com/people-pointers-9/the-easiest-way-to-tolerance-an-off-axis-mirror-4756

I have implemented a simple system composed of:Diode Source with 2deg divergence in x and y; Diffuser implemnted with cylinder volume with a single scaterring surface following a gaussian model with sigma = 0.27 Polar detector to monitor the angular distribution of energy after the diffuser in the range -90, +90 deg; After exporting the detector data using the ”Detector Viewer", I have fitted the data points with the gaussian model described in the Help documentation: BSDF = A*exp(-x**2 / sigma ** 2):The value of the fitted sigma (sigma_i = 23.194) has nothing to do with the specified sigma of the diffuser (sigma = 0.27), which tells me that my interpretation of the scattering model is wrong. Where does the discrepancy come from? 

I am in non-sequential mode trying to design coupling optics to fiber couple a Lambertian source into a 980um/0.57NA fiber.  After completing my design which consists of two even aspheric lenses, I want to perform a tolerance analysis.  In sequential mode there are many operands available to tolerance lens surfaces. How do I go about tolerancing the lens surface of each aspheric surface in non sequential mode?  What options do I have for lens tolerancing in non sequential mode?