thank you for the solution. I was able to make it work for a single field, but now I ran into another wall. If I try to define multiple fields via MGNDATA test_MGNDATA_2x.flair (2.2 KB), FLUKA stops again this time with ERROR Field BEND not found or in not correct order
The card order in the .out file does not correspond to the order in my .inp file, so it looks like this issue is connected to the recent fix to MGNDATA and MGNFIELD card order.