Very, very curious. After restoring a backup from november 2018 (in that time UE 4.18 and 4.19 was running without problems as i made the backup) UE4.18 and 4.19 crashes too now. That let me think I have a problem with the hardware bud only for UE4. i can’t believe that but that is the one and only possible reason :-(( There was no change in the hardware between the time I made the backup an now. As I restore the backup I was not in the internet so nothing could be change. I have no idea what I can do now.