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Pretty much everyone has had the potion target needed error. Last night, I had a new error where I was maxed on items so could only buy elixers. Every elixer worked except for the green one which would take my money but not give me the effect.
I did not buy any green elixers the whole game until I was maxed on items so I don't know if it is totally broken or just doesn't process the items full direct buff. I will to buy one today.
In case we are keeping track, the game was a custom 1v1 on Twisted Treeline. I was Kennen. Every map buff in game worked fine. Even the Karate Kennen skin worked that game.
TLDR: Green Elixer does not work when items are maxed. Will confirm if item is totally broken on Mac.