This one has me baffled..it started today. After flying 10-15 minutes the acft heading will shift approx 90 degrees. At first I thought it was the scenery but I

Two words... Twilight Zone :)

Hello Joe.The good news is that I experience exactly the same problem since today... the bad news is that just like you I don't have any clue of what's happening !I used yesterday FS2002 without any problem, creating myself a scenery, and for the whole evening it ran without any problem.But since today I also noticed this famous 90 degrees-shift !Pleeeeease could somebody help us !?Jean-Philippe (Brussels, Belgium)

Jean-PhilippeI may have solved my problem...I suspect a scenery conflict in various scenery I was using for Turkey. I had spent the better part of a wk flying in Turkey using about 10 different sceneries for various airports within Turkey. I flew that way for 4 days then added a pretty detailed and rather large scenery file that covered the city of Istanbul. The scenery author was a guy named Turelli. It was after I activated this scenery that my troubles began.After a lot of guessing about the cause of the problem from various "experts" included the Microsoft technical Team....in India....I disabled all my Turkish scenery and the problem disappeared. I flew today in Turkey activating 3 different Turkish airport sceneries with no problems. I have kept the Istanbul City scenery deactivated.What is ur computer system? I use a Dell XPS PIII 667 MHZ, 512 MHZ PC800 Rdram, 32 MB Nvidia TNT2 Ultra card. I use Windows 98 and FS2002. I've found that Win98 is the most stable for FS2k2.I guess it would be too much luck to find out u were using the same scenery?? Plse let me know the particulars leading up to ur problems..Joe T