Changing App Stores - recent change?

In the past, I was able to easily change between my Canadian address and my families U.S. address in the Apple Store with ease. I have some purchase in the U.S. app store and others in the Canadian store. I was in the American store and went to change to the Canadian store today and no problems. Did what I have to do (i.e. some app updates), then went to change back to the American store. Except it won't let me because it says I now need to insert a U.S. credit card and doesn't provide me with the 'none' option. I even tried my Canadian credit card but it won't verify against the USA address! Ugh Apple!

Looks like Apple may have modified it last month - http://ift.tt/1Nqdq2N

Any ideas on how to get back in without a U.S. credit card?

via ehMac.ca http://ift.tt/1gaaRmW