Hoi Patrick.
Thanks for your reply. Because of an other problem (see my topic of missing taxiways at EHAM) i installed EHAM (Aerosoft) again. All the other scenery i had, before installing W10 on my "Display-Unit" computer. I did run the scenery update in the DataProvider on my FSX-computer (W7).
Before using Aivlasoft i used FSCommander. I had this installed on an old laptop. Yesterday evening, i coupled this laptop to my network. So i had running the FSX computer, the "computer with the DisplayUnit and the laptop with WideFs and FsCommander.
I used EHAM (Amsterdam Schiphol), LFPG (Paris, Charles de Gaulle) and LFPO (Paris, Orly). All the scenery is from Aerosoft. On FSCommander the plane was in the center of the taxiway/runway. On the DisplayUnit only LFPG was in the center.
Next week i will make more flights to different destinations and see if other airports have the same problems. Could it be, that this is caused by using two systems, W7 and W10.
Further, i am very happy with the Aivlasoft. It is not so important, but i would like to know the reason is.
Best regards and a happy 2016.
Anne