Yesterday, my wife called me from Valencia, Spain, because she was unable to get cash from the local ATM machines. We recently switched our accounts from Wachovia to a smaller local bank, The Lakeland Bank of NJ. Our ATM cards carry the Mastercard logo, along with the PLUS, NYCE and STAR logos, so I thought we would be safe. I also foolishly sent her without traveller's checks, as everything I've read in my savvy travelers guides indicates that travelers checks are passe.
After checking our balance to assure that it was healthy, I called my bank and was told that Mastercard blocks the ATM service in Spain. I was told two stories, one customer service supervisor told me it was not the Lakeland Bank's fault, it was a decision made by Mastercard, because of homeland security and there was nothing they could do about it. Another manager at my local Lakeland Bank branch said the bank was looking to update the service they selected to use with Mastercard so that countries like Spain would be included. I wonder if you have any idea where the truth lies?
The take home lesson seems to be that you cannot assume that your ATM card will work abroad and you MUST check with your bank and give them a full itinerary of where you will be traveling to assure that your card will work in each country. I also wonder whether specific cities in countries could be "blacklisted"?