Recently I went to re-install KLAX since the Addon Manager decided it was no longer in my FSX. I usually get "Scenery is Active but not installed in scenery library" I guess this happens because I usually always disable airports I am not flying over but this is not the issue. I re-installed KLAX and went to open FSX. But it crashes without any error on start up. It opens for about 30 seconds and then closes. When I uninstall the Addon Manager everything works fine, but with it installed, FSX does not open and closes without error. I have the latest C++ files, I have disabled the folder from my anti virus and I have tried deleted the Esellerate DLL and re-installing addon manager. No methods work unless I have no addon manager completely. I tried installing another airport. This time being Chicago and the same problem. I have concluded that the cause of my FSX crashing, without error, on startup is the Addon Manager. Sadly I know not what in the Addon Manager causes this. No issues installing airports from this company until today. I tried to install KLAX v1.5.2 and Addon Manager v2.9.