I have 37 charades potions in my pack. I drag one to the "sell" cell in the tool vendor's dialog; the display updates to tell me that the vendor will pay 300 currants each, but doesn't tell me how many I have. I click on "Max", and the number doesn't increase. The "+" and "-" appear to be disabled. When I try to type in a number (like 37), all it will accept is 1.