Sorry for bringing up this old topic, but as Lasiaf said i am curious as well.
There are some conditions that have occurred to me as i used the bot in which it skipped every mob.
1. Offset had changed for both target and miscbase.
2. Attackmonster or Ignoremoster were used incorrectly.
3. Attack Distance was set to 0, hence it did not attack anything.
4. Error with INI file.
Another fix i found was, setting the Ignoremonster parameter in GFBOT.ini to 30, meaning anything it finds it will kill, use at your own risk however.