Just FYI. I have a very large cooling tower - 7000+ Inventor parts - ~30,000 Intent parts. I'm trying to debug a drawing error. It runs fine to create the model in about 2 hours. Then I add the drawing and get the error. It is kind-of a normal error I think... nothing special. 3 times now, however, I've gotten to that state and then started to debug the error and at a point when I was seemingly doing nothing - looking at the code or the tree - out of the blue Inventor crashed. It has happened on at least 2 different computers.
I know you can't do much to help at this point.
Maybe I should set it up so you can run the code locally. That would be some work, but might be worth it for other reasons too.