No the normal client seems to be working pretty well. These errors are pretty inconsistent. Last night I ran and when I woke up it was fine. Later I logged on and started it, came back after a few hours and it had logged out at the bank. Started script at the bank and it just kept clicking east towards the outer portion of the area. Kind of like where it is now. So I walked it back towards the ladder and it seemed to continue on doing its thing for a while. Not sure how long it would have continued I'm afraid. And no it won't mine the rock falls. It only moves if someone else mines the rock falls. After this post and picture here I restarted for about 1h with success. So its very inconsistent with the errors. The only thing that is very consistent, is where it walks after it banks. Totally away from the stairs. Every time. Which is just kind of a bot flag I feel like. I really like this script, so know that I'm posting this with the best intentions, not as a slap in the face.
Edit: It mines the rockfalls up stairs, but when it some how get stuck downstairs, it walks through rock falls other people have mined, one at a time. It could just be a mirror client optimization type of issue. I'm not sure. Also, I'm not sure how long it gets stuck like that for. I believe if no one mines a rock fall for it to keep moving, it will log out. Thats a guess though
I'll run it tonight and see what happens. I'll keep you updated.