Ok, you made me actually fire this up and run it. Probably the first time in more than 2 years. Seems to work fine for me. I went through a couple runs without issue. What version of EUO are you using? And what Windows? Something is different for you for some reason.
Edit: I went back through and re-ran the guided setup. This also works fine as well. When you bring up the bugs context menu, DON'T select the Open Backpack function. Let the script do it; there is a delay, but the script *is* working....