One of the quirks of epub is that different reading programs have different limitations. Most use Adobe Digital Editions for their reading software. It once had a limitation of 300K or so per file, requiring the breaking up of the text internally. Two major open source readers, Coolreader and FBReader, can't handle an Epub TOC (table of contents) greater than 50 entries. So if you reader is using one of those reading software, big omnibus will hang and then dump.
Most people are building to ADE specs and not Coolreader/FBReader specs....
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