MarketPress Doesn't work at all

I am trying to set up marketpress but I keep running into problems. First, it wasn't adding the shipping cost to orders when it sent the customer to paypal, and now I am realizing it isn't saving shipping info either and there is nowhere to put your zip code in the cart to estimate your shipping cost, but it still has an estimated shipping field! The whole plugin is broken in multiple places and it is really starting to make me mad. Yea it looks a little nicer than the old version, but this version is completely useless!

By the way, I have already enabled support access if you want to take a look.