Jim I've recreated a similar flight between EGHI and EGBB as before and close to EGBB I started getting the memory warnings as before although it did not actually crash this time. Having said that I did notice that the scenery at EGBB was not displaying as it should. As an aside, but perhaps not for this topic, I have been having some difficulty starting the engines since a reinstall, having to reload the aircraft after which it worked normally.I mention this in case it is relevant. Here are the promised logs. Martin Log.txt GizmoLog.txt