I was just asking about that yesterday, got the same message when I tried to reply a really generous customer who tipped me over 100$ 3 days before. And I also couldn't add him to contacts, I got msg that I have to specify recipient. I really hope he didn't block me, I don't know why he would do that. We just talked for a while, and his msg to me was also nice. Don't know what happened, really.

