Player stops moving/gets stuck

Both Grinder and Quester has this problem. My char gets stuck on something and then I have to turn off bot, accept quest and then turn on again. This happens a lot of times, and the bot is not smart enough to walk to the right place. Also when using grinder, my char stops and does not move untill I restart both program and game

On the picture I linked you can see a problem. The bot keep running into that wall and do not go around and up the stairs.