Reviving this very old threat - I wonder what happened to OP.

For an upcoming flight (in about 72 hours) I have started to notice a discrepancy between CX MMB and Expertflyer (which wasn't there before).
Per the CX website, we are in 30H&K (called them up to get 30H ages ago (oneworld Emerald)) but on Expertflyer 30H is now again showing as blocked. Surely this can't be due to a last minute infant booking, as that seat should then show as taken rather than blocked. Any idea what might be going on here? Is it worth calling again, or will the agents only be able to see the same thing I do on MMB?