"This is a bug in OS X that appears to have been there since back in the
NeXT days.
On various mailing lists people refer to this as beeing the most common
failure seen by end users, but no one seems to know what exactly is
causing it. It can happen almost any time you are running anything
significant on an OS X machine. At the simplest possible level it means
that something in the system was trying to send a message to something
else in the system and failed and is going to try again. For the most
part it can be ignored, or so I´m told."
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/glemme