Automatic Shipping

[oldbarn]

My VM2 install was working ok in terms of shipping. I use USPS and have them setup based on weight. Each product has a "weight" and during checkout, the shipping method was automatic with either a small, medium, or large flat rate from USPS. For some reason uknown to me, it no longer does this. Now when you check out, you have to select the shipping method which I don't want. If the customers buys enough product that requires a medium flat rate and they select a small flat rate, I now have to contact them to let them know and recharge for higher method. Any suggestions?

Edit: BTW I just updated to 2.0.20b...im assuming that is what made it break.