After you save changes to the summary for a book: when you navigate back to the Details tab, the changes initially show up, but as soon as you do anything else, they disappear. They are definitely being saved as intended; they show back up after a long, unpredictable delay (so far, I've seen it take anywhere from 20 to 90 minutes). This is going to give admins the impression that something is broken such that their work is just being discarded. It might not be worth fixing the underlying cause (I will investigate, but my sense is that this would involve significant changes to the way the metadata wrangler communicates with the circulation database, which might break other, much more important, things). But we could definitely just add a message to the effect of "please note: your changes have been saved, but it may take several hours for them to appear in the Details tab".