ok so the exchange of gold will only happen once you reach the shop, in other words you cant purchase whilst you are on the field? Uhm if thats the case some people are going to find themselves short of a lot of items. lol it happens to me time and time again, murphies law i guess, i save up for something then when i want to buy it get ganged and end up not having enough cash again, its a vicious circle.
haha, that happens to me when im doing bad in dota xD