Just to confirm from the Rite of Spring thread - that issue does indeed seem to be caused by the bassoon grace notes in bar 4, immediately before a nested tuplet.
Just now I tried erasing the the nested tuplets in bar 4 and re-inputting the bassoon part. I can re-enter everything except the two grace notes just before the nested tuplet (other grace notes are fine, and so is the nested tuplet itself). The program doesn’t crash, but when I try to enter the grace notes, or copy-paste them from bar 2, nothing happens. Thanks, and I hope that’s useful info!