Let me just preface this by saying I know nothing of Drupal. I am a wordpress developer but my company just inherited 2 drupal sites from a company we recently purchased. I am using Drupal 6.25. I have 2 classes of products that I need to change shipping for. It's free for US east coast and $199 for US west coast. There was a generic free shipping already set up and working but I need to change for the shipping increases. I tried using the flat rate and conditions but I kept getting "Invalid option selected. Recalculate shipping quotes to continue". I set up west coast fine. I did 2 groupings - a main AND group with 2 OR groups in that - 'or' for the shipping states and 'or' for the 2 product classes. I disabled the previous free shipping and the west coast works fine. I set up a separate shipping for east coast just like the west coast but opposite states. It works fine if I disable the West Coast. So, obviously I am doing something that is conflicting when both are enabled.
Any and all advice is greatly appreciated!