nevermind, it finally works now....but am not sure why it wasn't working before
Is there a chance you sent a smaller amount this time or they've send a payment somewhere since you originally tried?
It could just have been a node between you both was down but if it wasn't, it's probably related to this
https://bitcointalk.org/index.php?topic=5329718.msg56752057#msg56752057 - they might not have had enough receive capacity.