PE: Back Button in Series Payments Screen does not work

When purchasing a subscription in PE, and you get to the payments screen, you can't go back. If the amount came out to an amount that you did not expect, you have to start all over. This in combination with the commissions resetting during the subscription-selling process makes this bug especially frustrating. (you know, when you add a commission or discount, and then click the events button, the changes dissappear!)
I have been told that this might be fixed in the next version, but it is not out yet. It may come out soon. It may come out later. Woe. Woe is me. I'll be in the server room crying on a pile of cat 5 network cable. You can cry on my blog if you like. There there. Does that feel better?