What many folk fail to realize is it is NOT an always: 'Does not Work', but it is FRAGILE.
Timing, Race Condition, (and the big Not Supported) Multi-(in)use interaction.
Calibre performs a Sequence of actions every time you make or update an entry. It expects the action to have completed when it move on to the next step. That may not be true with a buffered operation (network/cache) in use.
Toss in Anti-whatever checks and you get more delays (and I DO NOT endorse disabling Networked file checks, only a local disk Library..if needed)
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