Win XP Pro, Calibre 0.7.0, Sony 550 - regrettably I'm experiencing similar problems - collection of ~320 title spread over main memory and two cards in the reader. Every change made when the reader is plugged in is taking ~2m 30s. Exactly the same symptoms - a very fast update and then an agonising 'sending metadata'. Will see if this recurs on 0.7.1 - just a passing thought, is *all* the metadata being re-sent or just the metadata for the modified item(s)?
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