Umberto, I already tried that without success....and anyway the normal black screen due to shaders rebuild, as far as I know occurs when you launch the flight, not when you are loading the sim (which is what actually happens to me). It might be useful to know that the first time I installed the new Addon Manager, and it forced the migration of the folders in the new location, it went ok and I was able to run the sim flawlessly, as I wrote also in another post, I loaded LSGG and then in another test I loaded KJFK, and they were all showing fine. Then all of a sudden it stopped working, and the only way to restore it is to remove all your (and Flightbeam) addons. I am using Scenery COnfigurator Editor and I also thought it might be sort sort incompatibility with the new scenery concept, so I uninstalled but no success at all.
Any further ideas ?
Thanks
Ezio