Hi, I have a serious problem with my iTunes account. Hope someone able to help me out of this mess.

I have an iTunes account which is registered to US store (without credit card) just to download free apps but recently i've changed the account to Singapore store with my credit card billing info.

Now here comes the problems whenever I tried to update my apps. The iTunes will show xx updates available but when i try to update it shown no updates available. In fact, I'm able to check the updates through my iPhone (and yes, it shown the available updates in iPhone).

Has anyone encouter the same problem and any solution for it? It's really troubling me lot.

thanks in advance.

no. it's still under the same account (same iTunes account ID) but i've changed the country from US to Singapore.