Problem with Paypal donation - might it be because it's from Japan?

I just tried to donate, and Paypal gave me this message:

Sorry — your last action could not be completed

If you were making a purchase or sending money, we recommend that you check both your PayPal account and your email for a transaction confirmation after 30 minutes.

If you came to this page from another website, please return to that site (don't use your browser's Back button) and restart your activity.

If you came from PayPal's website, click the PayPal logo in the upper-left corner to return to our home page and restart your activity. You might have to log in again.

We apologize for the inconvenience.

I tried again a few hours later - same thing. Then I remembered that due to some law in Japan, Paypal users whose address is in Japan cannot send money to other people ("non-commercial" purposes, e.g. wiring money to a family member). Wikipedia is also non-commercial, and I recently donated to them using Paypal, but they may have done some sort of special registration with Paypal as a non-profit foundation. Anyway, does anyone think that might be the problem? Or should I just keep trying?