On Nov 7, 2012, at 7:23 PM, Graham Cox <graham....@bigpond.com> wrote:

> Never mind, Time Machine saved my ass. I must have touched the file somehow 
> (why are these writable?).

Bet it's another case of autosave doing unintended harm.  Checking the "Ask to 
keep changes when closing documents" option in General System Preferences helps 
mitigate the issue.

Marc
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