Thanks so much for taking the time to look at this issue.
I am not able to reproduce the crash in a clean project. It is just the one project.
Log file is here: http://pastebin.com/bGLUQ9GL
I guess this is the bad guy huh ? : "LogSpawn:Warning: SpawnActor failed because we are running a ConstructionScript (DefaultPhysicsVolume)"
Once again: thank you for your time.