I don't know if this was an issue before (I haven't had much time to devote to this), but the KF8-only portion created by the split feature no longer recognizes its own inline (html) TOC. Which means the Go To->ToC feature of the Kindles (or the KindlePreviewer) doesn't work. The html ToC is still physically there, of course... the Kindle just doesn't know it's a ToC. (Note: this would be related to the "toc" reference item in the guide portion of the OPF, not the NCX—which works as expected).
The mobi-only portion of the split feature doesn't seem to suffer from the same problem. I'll look, but the splitting code is all brand new to me. It might take me a bit to absorb what's going on. In the meantime, let me know if you'd like a sample book that exhibits the problem in KindlePreviewer after splitting.
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