So I believe what you are seeing is not specifically anything to do with Win8.1 but just the same SimConnect bug that affects some folks, where SimConnects trust checking mechanism runs behind the execution part and the latter jumps into the start place which is not yet actually loaded.

They managed to reduce its frequency in SP1 and SP2 but were still trying to locate the thing when they got closed down.

If I could actually reproduce it even on one of my 6 FSX systems I might have a chance to devise a work-around, but it has never even happened once here just as it hasnt on many others systems.

However, If this problem is consistent on your system, perhaps I can use you to experiment with small changes in the start-up part (DLLMain).

I cant do anything with DLLStart because the crash is actually in SimConnects call to that routine.

See if it helps at all -- just a 1 second sleep in the DLLMain routine, to try to allow SimConnect to catch up.

If no joy Ill try 10 seconds (ugh) and if that helps, wind it down again.

If delays here make no difference I cant really see anything else I can do at all.

It was written up in the FAQ subforum as thread Possible solution for FSUIPC access violation.

There shouldnt be any there in any case.

Version 4.921f of the Installer is now up.

Im using Windows 8.

Are they both USB sticks and have you turned off power saving in your USB settings.

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