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It seems that the Nickel reader (firmware 3.5.0) doesn't like when the OPF and NCX files have different uid. This is required by the spec, if I remember correctly, so it could be argued that it's not a bug, but other readers can easily ignore this, while Kobo fails miserably (black screen when using the TOC, or crash and back to homepage when turning a page, with the book marked as finished).
The two book series I have bought (in ePub format, different publishers, not from Kobo), have this problem. Fortunately I'm a "power user" and I have been able to fix them, otherwise I'd be really pissed off. This kind of thing is worse than DRM.
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