So this just happened, halfway into my flight from Hong Kong (VHHH) to Kansai (RJBB) all my engines (4) quit. I have no clue how (I have failures disabled), I suspect it has something to do with the way the fuel loading was done for its respective tanks etc. I tried to re adjust the fueling from the menu and restart, but, none lit up. Fortunately I was at FL390 doing Mach .86, had plenty of speed and altitude to work with and to make it even better I was just approaching Taipei (RCTP). Somehow, managed to get it on the ground.
The funniest part in all this was the 748 floated halfway down the runway without any engines
Here are some screenshots.