I just tested GE and it seems to be working perfectly, is there a chance you selected this option?
This [Buy whole amount needed] combined with [No supplies left] are not compatible because you need to tell the bot how many to buy. It didn't work when I tried this, but as soon as I told the bot how many to make, it worked:
Either way - I'll adjust the interface so it's easier to setup and so there is less chance of selecting a bad combination of options.