I recently placed an order with Dell, but kept getting messages that they couldn't process it. After spending five hours on the phone with multiple customer support people, they finally told me it was because my billing address was different than my shipping address, and that I wasn't allowed to do that.
I once had to place an order with 3M. For this product, their website lists the product, then directs you to a page listing the suppliers you can order from. I needed it shipped to New Jersey, so I chose a supplier in Pennsylvania to keep shipping costs down. When I asked for an estimate, their website balked, said it couldn't make an estimate. I tried actually placing the order, but it kept kicking up this error message.
Over a period of like two weeks, I kept trying to place this order, and it simply would not go through. And it really seemed to be related to shipping somehow - it always generated the error when it tried to calculate shipping. I tried multiple addresses in New Jersey, but the website simply couldn't cope with any of them, anywhere in the state.
Finally, in frustration, I tried a bunch of other addresses and determined that the website would ship to Virginia. It really felt like that old "our email won't go more than 500 miles" tech issue somehow. Anyway, I had them ship the package to Virginia, and then our manager there forwarded it to the clients. But it was incredibly frustrating at the time.