[kordless]

Agreed. It's known that Mt. Gox was auto-retrying sends after the txids didn't match.

FWIW, I submitted the 'what most likely happened' post last night: https://news.ycombinator.com/item?id=7328219. It's a bit shorter and seems less speculative.

[waterlesscloud]

Can you link to evidence they auto-retried? Last I'd seen it required contacting their customer service for a manual re-send.

[kordless]

I've read it several places, but don't know the exact source of the information. It's mentioned in this article on the Guardian: http://www.theguardian.com/technology/2014/feb/27/how-does-a...