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Okay. Fixed by deleting registry key as described here: http://forum.simflight.com/topic/73518-possible-solution-for-fsuipc-access-violation/ Thanks for your help.

Thanks for your time on this Pete. The Windows 10 build is 9926 (the latest full build available with various updates). I dont have any major problems with FSX or P3D in Win10 although MyTraffic5.4c is causing ntl.dll errors in P3D. (In fact it is better than 8.1 because there are no joystick disconnects.) Strange thing is that FSUIPC was initially working yesterday afternoon but P3D would not start in the evening without removing FSUIPC. I have lots of the system event logs which are similar so I just picked one. Anyway, Ive just generated another one but there is no concurrent FSUIPC log. Maybe a P3D reinstall is needed. Have a good trip. Regards Howard Edit. Apologies, our posts crossed. Log Name.txt

Sorry for delay. The system is Windows 10 Pro Build 9926 with a clean install of p3d 2.5. When I start P3D you initally briefly see the scenery indices 'bar' move across the screen and then a few seconds later an error is reported: Lockheed Martin Prepar2D has stopped working. Unfortunately I cant upload a picture. Ive attached the report from the event viewer and FSUIPC log (name removed). Crash Log.txt FSUIPC4 log.txt

Hi I installed P3D 2.5 today together with FSUIPC4939. This evening I cannot start P3D without removing FSUIPC from the Modules folder. Looking at the event viewer the following is reported: Faulting application name: Prepar3D.exe, version: 2.5.12942.0, time stamp: 0x54d283cc Faulting module name: FSUIPC4.dll, version: 4.9.3.9, time stamp: 0x54d9e947 Exception code: 0xc0000005 Faulting process ID: 0x17bc Faulting application start time: 0x01d04637ebb1c7e0 Faulting application path: E:\Program Files (x86)\Lockheed Martin\Prepar3D v2\Prepar3D.exe Faulting module path: E:\Program Files (x86)\Lockheed Martin\Prepar3D v2\Modules\FSUIPC4.dll Ive downloaded a new copy and tried it but P3d fails to start with that. Removing the ini makes no difference. I would appreciate your thoughts.