Hello,
just tried yesterday last version.
Flying with 737NGX on a simple scenery (no addons in that area), repeating an already successful route, I had repeated fsx crashes indicating ntdll.dll as the cause.
the problem arise sistematically every 15-20 min, so in a 90 minutes flight I restarted a lot of times reloading the last autosave flight.
Googling around I found this error can be due to almost anything, expecially bad drivers problems.
But the only change I made in last week was replace fsuipc.dll with the last version.
I kept the previous version I saved on my disk (4747) and restored it, then I was able to complete the last 45 minutes of the flight, and added additional 20-30 min parked at the terminal.
Don't know in which way fsuipc.dll can interact with ntdll.dll but at the moment all seems work fine again.
I'm using autosave feature every 5 minutes, wind smoothing, and a couple of joystick buttons mappings to keyboard (not used yesterday, reverses and push to talk).
If you want, please try investigate about this.
If i can help with some more accurate troubleshooting (take error picture, send configurations files) i'll do pleasantly.
Claudio Colangeli
Italy