This is the right place to post.
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The 502 errors have been occurring over the last couple of days, since an upgrade to the system. I agree they’re a complete pain. They have been reported, so hopefully a fix is not too far away. In the meantime, our apologies for the inconvenience.
(See http://www.sitepoint.com/community/t/very-strange-502-error-still/119454)