Marketpress is losing me money. Is anyone helping me?

I would like to know if anyone is helping me?
Every order that fails to charge shipping is losing money.
Marketpress has failed to calculate shipping on all orders today regardless of destination.
You will see from our site that we only sell two items, no downloads.
Both items have weight and the shipping is set to weight levels.
Please can you let me know what is being done to help me resolve the issue and stop losing money?
Esther