I agree with Don. My first clutch this year was a disaster (lost the whole clutch) and had a similar clutch last year (different pairing). Other clutches in the same incubator laid around the same time are hatching out with no problems so I don't think it was a temp spike or humidity issue but more of a compatability issues with the parents. Maybe something happened between ovulation and the time she laid who knows.
Sorry to hear about your clutch...try to hang in there. It really is a great hobby and the good times will out weigh the bad.