Aha! No more backtraces at home, but getting them at work. I took the liberty of installing some other dbg packages, e.g. for gtk2 and glib, to get a more complete trace.
** Attachment added: "Backtrace from Nautilus crashing" http://librarian.launchpad.net/6338527/dbg -- Trying to get samba share results in weird filetype error https://launchpad.net/bugs/24660 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs