Hello,
I uninstalled GSX last night and a while after reinstalled it. I didn't deactivate GSX through the add-on manager either. As I went to install GSX, FSX crashed every single time on the splash screen, I have concluded this is due to add-on manager. I tried various things and uninstalling GSX along with add-on manager and coutl and it fixed it. I proceeded to reinstall GSX and it did it again, after uninstalling GSX again without uninstalling add-on manager and it still didn't work. I tried various other combinations and they all resulted in crashes from the add-on manager. I imagine this is a piracy protection thing etc. as I didn't deactivate it. Request details of payment etc if required.
Thanks,
George