so I bought a vendo! I know, I know..... I set it up, the machine is fairly new, and in great condition, I changed the bill acceptor, there are 10 lines in the machine, and 9 buttons, I am slowly learning the machine menu, it vends everything perfect, except 1 selection, sometimes ill put $1, and it will not vend, so I put another $1, it then vends, the next time I put $1 in, it vends for $1, this happens every other time, on this one selection only. what is wrong with it? what do I need to do? is it something in the menu?
2. I do I remove force vend? when I put $1 in, and press coin return, it will not return, and force me to purchase, please help