I just re-upgraded to 1.5.11+cvs20060126-1 after reading the message at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=351337;msg=23 and for some reason mutt isn't segfaulting *now*. I've made a few changes to .mutt/* since the "follow-up" e-mail, but even after reverting those changes I cannot get Mutt to segfault at the "Sorting Mailbox" step (specified incorrectly above--oops).
Since that initial email my IMAP server (Cyrus) has been upgraded to the newest version in unstable, but other than that nothing has changed. I'd love to get Mutt to fail again to try to help track down this bug but now it is working as it should. If the segfaults return, I'll utlize the advice given by Mr. Walker.
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