Here is the problem:
I was doing flight CPA808 from Hong Kong to Chicago (some 14h on the published route) and had to abort the session, so saved the flight to be continued later. Then did my usual routine when loading a saved flight:
Start ASN
Start FSX
Set the time and date to match the saved flight
wait for ASN to resync the weather with the saved flight
Load the flight
However when the flight finished loading, the 77W did not initalize and was essentially dead metal. I tried using the MENU button on all three CDUs to manually load a panel state but to no avail. I tried this thrice over the day and each time it would fail to load properly.
I never had this behaviour before SP1c but I am not sure yet if the problem is related to it or if it is reproducable.
Any idea what could be wrong?