OK, I guess only he/she knows.
But it's strange ... I got an answer to this question yesterday and it was a perfectly fine answer. And it was the only answer I had. Decided to wait a day before accepting it (per this discussion). So I log back in today and it's gone.
I've seen answers deleted before if a "better" one has appeared or if there's a problem with the answer. However in this case ... no reason I can see to dump the answer.