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It won't happen again. Sod's law - I had bought a UPS for that computer but hadn't got round to grovelling in medusa's hairstyle. It's plugged in now :)
I typed lock when I really meant to say flock; which is a major difference to the system. Files weren't being locked when they were written. It was an accident waiting to happen.
I hereby raise you to the level of official Webmaster World Bug Finder and Beta Tester.