I've noticed that on vendors there is no buy option for those balls of summoning. If there are bags of summoning in the same vendor they work just find. Right click or shift right click (in my case) and you get the "buy" thingamajig (technical term ) but not so with the balls. It doesn't work in either client. It's a not a real big deal but I thought I'd satiate my curiosity and ask if this is normal or a bug.