I've been trying to process an order problematically on my website. After a week or two of work I now have it working.... about 20% of the time. From what I can tell whether it works or not is totally random. When it doesn't work I get an error asking me to "please define the shipping method". It is obviously defined being that it does work perfectly sometimes. I read that this may just be a bug in Magento. Anyone else have this problem/ find a solution?