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Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

Sorry, I can't give a recipe, but this happens about twice a day
since I use prerelease 24.0.96. The situation is always the same:
I open a VM folder (VM = ViewMail), or I refresh an already opened
one. VM starts downloading messages from my IMAP server, annoucing
its progress in the minibuffer. And then Emacs crashes before VM
as finished downloading and displaying the new messages.

As an attachment I send the log file produces by Apple's CrashReporter
in MacOS X.