Liberapay is in trouble, here's our blog post that explains the situation and what you should do if you're one of our 2000 active users: https://medium.com/liberapay-blog/liberapay-is-in-trouble-b58b40714d82
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We've fixed several bugs in the donation disbursement process so if you tried earlier today or yesterday and you got a 500 error code then you should try again.
If you get a 400 error code instead, with the message "The attempt to distribute all the money in your wallet failed: X.XX remains", see https://github.com/liberapay/liberapay.com/issues/1172
