Hi Umberto, i recently bought ZurichX and Geneva, I installed both and i had P3Dv4 crashing, so what i did is reinstalled one by one and they crashed singularly, what i managed to do is that I used Lorby-SI AddonOrganizer_P3D_V4 took it off from the XML file and add ZurichX first on the scenery.cfg, ok, it worked and the scenario works fine, did the same thing with Geneva and P3D crashes.
Any ideas?