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I found the problem, and it is a calibre bug. It will happen with any custom column type where only one value is used. Explanation: if there is only one value used, the content server skips the "Values" page and goes directly to the books. There is an error there where the custom column lookup name is corrupted, so no books were found.
I have submitted a fix to Kovid. If all goes well the fix (or one like it) should be in calibre source in the next day or two, and in the next release.
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