Hi Jon,
Has there been any progress with my file? I have reverted back to the version I saved just before the crashes started to happen. Using that version (in the beta of Publisher) and the PDF I could export from the corrupted file, I have managed to finish the layout and final edit of my book and just got it published on Amazon.
I'm sorry for any unnecessary effort you and your team have spent on my behalf, but I promised my team the book would be published by this week and I couldn't wait any longer.
The good news, of course, is that I haven't had any problems using the current Beta of Publisher and am quite happy with the final results.