Not sure if this will be of any help to anybody but I noticed today after a very rare crash in modeller that if/when modeller crashes you get a message asking if you want to send a crash report and that modeller will close. Before you click anything open Layout within modeller and send the model to layout, although modeller has crashed it still has some functions working. Once your model has landed into Layout you can then shut modeller down without losing your most recent changes. Now before anybody mentions it I know that modeller saves your model after the time you’ve set in the hub but what if it’s just about to save your model when the crash happens and let’s face it, it always happens when you’ve just got it right!!