I did check and was surprised to find that I had version 3.7.5 installed. I thought I had updated it last year. So I downloaded version 3.999...... has a "z" in it. Started up FS9, saw that the module was now to the newest version and registered, started up pf3 demo but still got the same result. So I closed everything, started up the sim, loaded the plane at the gate in Stansted for a flight from Stansted to Manchester, keeping it less than 200 nm. But still the same result. I did check last night and I do have Microsoft.net framework 4 updated installed. Well, ok, beats me what the problem is here.