Absturz bei Taktstrichen und Taktwechseln

English forum, English reply:
It crashes even on a normal save or autosave. Most probably one or more of the parts a corrupt. Remove them all and regenerate

Or give the new 3.5 Alpha a try, it doesn't crash on save, but indeed too crashes on changing the time signature, so back to the 1st recommendation

Actually it seems only the Piccolo part is corrupt
Strange enough after having fixed that the crash on save is gone, but the crash on changing time siagture is not.
Deleting and regenerating all parts helps with that though.
There were some parts with more than one instrument (Sinfonie Orchester klein, and ...gross and Probentag, all containing also that potentially corrupt Piccolo), I didn't rebuild those in the attached.

See also #292064: Crash on save of a score with corrupt parts