Great Editor!
I edited and tested nearly everything over many seasons.
No crashes except the known Driver Transfer issue and when giving npc drivers an injury personality trait.
But now I found a problem caused by Track changing.
First it seems there is a special date in the ongoing season before you have to choose next years tracks to actually get them in next years calender.
When I tried to make a whole new calender and deleted every track except the last one in week 48, all races which I added (of course using week 11 - 46) were marked as track 2-8 in the ingame calender.
So car constructing continued until november, no race was actually triggering and it leads to the famous crash pop up!
Next time I tried deleting every tracks to make a whole new calender, but you can only add tracks until week 46 in the editor.
Everything worked fine until my last race ended (In week 46).
Suddenly 28 polls were triggered to add a track in next seasons calender.
I just allowed one into next years calender... but anyway no chance to avoid the crash pop up later.
I don't know if this is a known issue
just wanted to let you guys know