Dear ZEMAX Staff and fellow Zemaxers!

My question might be very silly/simple, but I have limited experience in non-sequential mode. I noticed this issue for few days, and I have tried all the tricks that I could think of. I guess it's now a good time to check with the experienced users. Maybe my struggles are quite straightforward to you.

I have this optical system that light from a filament source was collected by a condenser. After passing through the slit (I made using an Air gap nested in absorber). The beam will be reflected through prism mirror then travel upwards. 

Here is the issue: When I use the filament source even it emits randomly, the layout always captures/displays the beam that follows the optical axis of the system. However, when I changed the light source to a Cree LED that I created based on supplier datasheet. Even the beams are still random, but there is never a beam will follow the optical axis anymore. Please refer to the diagrams below...

I understand maybe the beam (based on the “layout rays” defined) may only show as an illustrative purpose. There is always beam passing the slit and going through the system. This I tested by placing the detectors in the system. But this issue still bothers me for few days. Can you please kindly help me?

I have zipped the source files below for your reference. Thank you!

F.Y.I I really appreciated Mark’s ZEMAX tutorials/resources on YouTube. Thank you.