Hi all: I think this is a bug but I will let you guys try it out as well. Although I discovered this issue only in 2026 R1.04, I believe it may be happening in previous versions as well.

Using Tilt/Decenter tool crashes the LDE. Example LDE setup as shown below.

Cross-Section
 

I have tried:
# Added Dummy surfaces before and after Surfaces 3 and 4 and use that as START/STOP in Tilt/Decenter tool → Still Crashes.
# Changed wavelength from IR to VISIBLE and use N-BK7 instead of SILICON → Still Crashes
# Used ZERO for all TILT and PIVOT values → Still Crashes

PS: I have opened a Support Case in parallel. Will keep you folks updated on what Ansys says.

Cheers!