I had some problems with paypal recently. Anyway I wrote an email and I want to share the reply with you. Perhaps it might dispel some misconceptions.
Hello my name is Season, I am very sorry to hear about the situation,
and understand your frustration and concern over this issue. I will be
happy to assist you with your questions.
By checking your PayPal account, we found the transactions on May 10
were unclaimed.
Please note that:Our PayPal system was updated on May 10, maybe there is
some influence during the updated when you try to accept the payments
from others.
We suggest you to accept the payment in a later time. If there is still
the same message to inform you to add a US bank account, please inform
us as soon as possible.
We will try our best to help you solve your problems.
I sincerely apologize for the inconvenience caused you.
If you need any other further assistance, please do not hesitate to
contact us.
It is my pleasure to assist you. Thank you for choosing PayPal.
Sincerely,
Season
PayPal, an eBay Company