Hi Frank, I started with no plugings with a clean install. Then I added them one by one. I start getting reproducable crashes when using SkyMaxx and UltraWx (EFASS) at the same time and the crashes stop when I disable either UltraWx or SkyMaxx. I am a passionate user of x-plane, not a professional tester. I dislike the sim crashing before finishing my flight. I will therefore keep one of the two a.m. plugins disabled until someone finds a clue. If, by chance, I find out more specific details, I will post again, of course. Thank you for your support and keep up the good work! Cheers, Heiko