I've been having the same problem here actually. Sometimes the quick cast buttons work, sometimes not, I haven't really seen a pattern as yet. Not a big deal for me tbh as I have the potions hot barred too as that's normally where I'm concentrating on.
When I click on the quick cast button I more oftern than not get the "Item is not in your inventory" message, they do cast sometimes tho, which is a little odd to say the least. I wonder whether the code's a little confused, so to speak, if it's still first looking for the old rare potions first.
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