ok... put me down for the same problem. The crash only occurs when I "End Flight" to go back to the Free Flight menu. If I Exit FSX, then there are no errors. I have created a new FSX.CFG file as well as disabled all add-on modules and there is no change in behavior. The application error log has the following entry: Faulting application name: fsx.exe, version: 10.0.61472.0, time stamp: 0x475e17d3Faulting module name: PMDG_737NGX.DLL, version: 1.0.0.0, time stamp: 0x4e4346caException code: 0xc0000005Fault offset: 0x00015173Faulting process id: 0xb14Faulting application start time: 0x01cc5a8bb5f0f69aFaulting application path: C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\fsx.exeFaulting module path: C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\GAUGES\PMDG_737NGX.DLLReport Id: 398aaa23-c67f-11e0-9585-b8a7f817f959 I know that the working directory is not optimal, but it has been working fine for a couple years and I'm not up for rebuilding my entire FSX environment, There are no UAC issues (disabled) and I have made sure that the aircraft.cfg files are not set to read only as has been noted in other posts. This is not a critical error, but more of an annoyance. I look forward to a fix. In the meantime I will enjoy flying this awesome aircraft! Scott Dell StudioXPS 435MTwindows 7 ultimate (64 bit)8gb ddr3 RAMlots of disk spaceIntel I7 920ATI Radeon HD 4850 (512 mb)