Very logical though, for System and other unprovable problems.
Save All, Quit All, Shutdown or Restart still applies in 2012 for OS X as it did two decades ago.
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Regards from brianF
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On 14/07/2012, at 6:02 PM, rdavis wrote:

> This also happened to me once. The document wasn't very large -- 20-odd pages, with maybe a dozen footnotes. I fiddled around with it for a while to see if I could fix it, but it persisted. Then it occurred to me to close and reopen the file, which I did, and that solved the problem. I was never able to reproduce it. Which is not to say that closing and reopening will solve the problem for you, but you might try it if you haven't already.
> 
> --------------------
> Rick Davis