As the title said: I experimented in sandbox-mode when suddenly the game just closes.
Restarted it and wanna load autosave leads to another crash.
faced that now several times.
output_log.txt (after trying to load game) and *.sav are attached.
showing: [WARNING] Insufficient keys to cover root plan menu Max of 12 keys supported but TUNING.BUILDINGS.PLANORDER has 13
thanks for your effort