Yes, I loaded the equipment in the inventory GUI. I'm not sure that it would check the charges of the tome of fire if I didn't......? It doesn't count the tome of fire as fire runes, mate. It also doesn't let you use a rune pouch and then additional runes outside of the pouch.
The inventory/equipment tab issue is something that occurs right at the start of the script when it has something equipped it needs to check the charges for (blowpipe, tome of fire, etc.) and then goes to get potions. It will get the first set of potions with no issues, but since it is stuck on the equipment tab, it just sits and does nothing because it doesn't know how many spaces are available for the next potion I'm guessing.