Yup -- I checked the link manually and Axis360 shows an Error Ebook Not In Collection or whatever message to that effect. That's why I said "it's because the book doesn't really exist at the library".
As for unlinking automatically -- I guess I could do that.
How well does it handle searches which error out, or the inconsistency in returned Amazon results? (I believe you once said Amazon results are inconsistent, that is...)
P.S. A more informative error message sounds great. Thanks.