Last week I had problems at our local Lowe's when I tried using a debit card in the self-check out. It would not complete the transaction despite repeated tries. I called over an assistant manager and he couldn't even clear the machine. We then went to a people-operated register and had problems there also. I told the manager I was concerned that there might be multiple charges. I eventually left the store without completing the purchase. Today, I checked my account and did find multiple charges for that event. They were credited back several days later. But, this being a debit card on my account, it could have gotten me in big trouble with non-sufficient fund, overdrafts, etc. I took a print-out of my account to the store and showed to the manager. He was very courteous but tactifully refused to admit possible charges when a purchase wasn't made. I like Lowe's but will stick to cash and a people-operated register from now on.