I think is something to do with the way the information that is used by the reader to support pagination for the different font sizes is set up. When using Calibre this is done on the reader. When using the Sony software this is done at the PC end, so it is a bug on the Sony for LRF handling. I find that after a reset a LRF file that failed often now works fine. EPUB does not seem to suffer from this issue.
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