thank you again for taking the point. I appreciate very much. Yeah that is possible ! I am using NOAA plugin and the crashes happen usually at cruise altitude, so the clouds are from the plugin and not from XSB. If it happens to me again (but hope not ) I will send the cache of the NOAA data + the gps location where it did happen. One again SMP is great, the support team is very serious, and I just don't imagine flying with the basic x-plane clouds !