I think I figured it out. If the custom field doesn't have any books marked for the values defined, then it displays a 404 Not Found. The values for my custom column are "past" and "future" (because in the English language, the word "read" can be past tense or future tense). I didn't have any books in my library marked for one of the columns, at all. And for the others, I didn't have *both* options represented.
Seems like that could become a problem, since eventually ALL the books in my library would be set to "past" for each reader and therefore there will be no "future" listings. (Ok, highly unlikely, but it *is* possible.) Does that make this a bug for custom columns?
Anne.
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