Yea its a child theme I am using. And when I switch back to the original Pinboard, it looks different (header and tabs), and the content is still missing.
Yes, I posted to the support for Pinboard. Thanks for that link!
Ok I am gonna try to review codex for child theme. I am not sure what to look for though. And I am still surprised that it all suddenly disappeared. Everything was working fine. I just don't get it.