Yep. When I went to Canada for Renee's wedding I called both my credit card company and my bank, who both assured me my cards would be fine in Canada. Then I got there, and had no money at all for a day and a half because they don't have the extra security features. Of course I discovered this while trying to pay for food. :/
Luckily I was able to withdraw cash from a bank ATM to cover me for the remainder of the trip, but it was a huge hassle.
I honestly don't understand: If American credit cards are not accepted by a large part of the world, why isn't this being changed more quickly?!