IIRC, someone had deleted the attachment directory I uploaded (which took about a week the first time), so I was not able to import any of the images that were inside it.
I would expect the table of contents to have a blank entry after the error occurred, because you have debug mode active on your site, which would halt execution before the table of contents recalculated. In order to recalculate it now, you will have to use Options > Manage Chapters, and change the Display Order number for any chapter.