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I'd recommend trying the latest beta release, htdig-3.2.0b6, to see
if that makes any difference. If the problem still occurs with that
version, try to narrow down which programs are failing. rundig is
actually just a shell script that runs htdig, htpurge, htnotify, and
possibly htfuzzy, so try running each of these manually to see
which ones fail. Then, see the last paragraph of http://
www.htdig.org/FAQ.html#q5.14 for tips on what to do to get a stack
backtrace from a program that crashes like this.