Users can't cancel Pro Site subscription

I have a huge issue with Pro Sites again.

A user today told me, that she couldn't cancel her subscription. Every time she clicked "Cancel subscription", a message showed telling her it is canceled. But if she visit the Pro Account page, then she still have an active subscription, and if she clicks cancel again, then it is just the same over and over again.

I testen this on my own blog, and upgraded with my own credit card. Tried to cancel it, and visited the Pro Account page, but I still got an active subscription.

Please help! You have support access if needed.