I've never had a problem with books showing up, but I don't use Calibre to copy them over so...
I do seem to remember someone having an issue like this that turned out to be a corrupted Mobi file, does this happen even when you copy one file (& have you tried different files)?
Are these DRM free Mobi's, books bought from Amazon or???
Do books show up OK if you simply drag 'n drop them into the Kindle's documents folder?
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