As of tor-0.2.1.30-2 and later, I've updated Tor rc.tor init script to get rid
of hardcoded values present inside torctl command script. To successfully use
the newer script be sure to check changes to both /etc/rc.d/rc.tor.new and
/etc/tor/torrc.new as some configurations values are now required and no
longer passed on the command line. The original TorProject.org torrc
configuration is always available as /etc/tor/torrc.sample.

Also, there has been a recent libevent upgrade from 1.4.13 to 2.0.10 in
SlackBuilds.org 13.37 tree, remember to rebuild Tor when such major upgrades
happen.