Another thing to try is to temporarily rename the folder you have all your media in (or open the file on a different computer that doesn't have the media) so that when you launch the file, Isadora can't find the media. If the media in the angry Scenes at the end is the problem, then loading the file without the media means you should be able to get into those Scenes to delete them, save the project, then change the name of your media folder back (or port the updated file back onto the computer that has the media), and then open & run the updated file without the problem Scenes.
You could also send us the problem file and tell us what Scenes are the issue in a support ticket using the link in my signature and we'll see if there's anything we can do for you.
Best wishes,
Woland