I got an offer from Capital One a couple of months ago to make some one year 0% interest transfers to my Cap 1 card. I had some expiring 0% balances from a Lowes card and a 9.9% balance on an AmEx, so I decided to take advantage of the offer.
This past weekend I perusing my statement and noticed the interest rates on my Cap One card were the same for the entire balance. So I looked back at the last couple of statements and sure enough they had not applied the zero percent to the new balance transfers. I called Capital One and they told me there was a glitch in their system and they would take care of it. It sounded like a large glitch, not just for me.
So if you have transferred money to Capital One recently expecting to get a zero percent interest rate - better double check your statements!