I have a site at dogni.com that sometimes works, sometimes does not.I cannot understand what the issue is. If you add a product to the cart and try to checkout, it will not let you elect any shipping options. If I go in and save my settings for the shipping options, it appears to work, but this keeps happening and I cannot figure out what is causing it to keep resetting like this. Anyone else experienced this? How can I fix it? Problem persists on different themes as well. We also are using a couple add-on plugins for this commerce solution: Gold Cart, WPSC variation images; could it be coming from one of those?