I flew a roundtrip, DFW-DOH-SIN (C) & SIN-DOH-DFW (I), a couple of weeks ago. The outbound flights (DFW-DOH & DOH-SIN) posted within a day or two, but I'm still waiting for the return flights to post. (The outbound and return were on the same ticket.) I've submitted the missing mileage request, but I haven't received anything other than the initial automated response.

Any idea what could cause this?