Al kharid 3 iron rocks and dropping. I think it may have to do with swapping worlds. I'm still trying to reproduce but its happened at least 3 times. I was able to hide the HUD btw. Much appreciated.
EDIT: I just had it happen again. I changed worlds with 12 backpack slots free, left it on the "World Switcher" page, started the script, and then when it filled up the backpack, the "Your inventory is too full to hold..." popup appeared. It never dismissed this popup and it kept clicking the rock over and over.