As mentioned by a few, and I'm lazy to ready 12 pages..
Looter gets stuck, it is just standing still not doing anything, caveboot, looter, targeting is on. As son as you turn looter off it starts moving again, and if you turn it off, it wont move again, no mather where ou are. Happens to me daily. Need to restart the client to remove this.

And the looter is quite often not looting. For example in my deeper banuta script, it's killing 5 monsters, looting 1-2 and runs away.