Hey (:
Replied on my phone, for some reason the reply didn't go through? I'll summarise what I said:
Essentially, these are both to do with the client. The first one you mentioned is to do with OSBots WebWalking system. While this system is very powerful, it can at times fail (understandably) and as a result I would recommend starting the script at (or close to) sand crabs. If you're looking for a quick way to get there, put your POH on kourend and use house tele-tabs - that should take you there almost directly!
The second point you made, if I understood it correctly, is caused by the script attempting to move the mouse outside the screen while idle. When you override the mouse movements, the script will continuously try to move outside the screen but you wont let it! If you want to interact with the game while the script is running, you should pause the script, and then resume it after you have finished. And yes, the buttons are controlled by the client.
Best,
Apa