There is something I cannot explain:in some airports in Northern Canada the runway seems to "float" on the ground. Basically what happens is that the runway stays fixed where it is, but as the plane moves the ground underneath moves, as if the runway shifted by several tens of meters.I have FS Genesis and Ultimate Terrain installed, and for some airports I use Sid Schwartz' Nunavut airport add-ons.Any ideas?

Never heard or seen of this, Most of my flights are done in Canada, any particular airport for a test run??

You will find in the far northern latitudes some strange visual effects in the sim.North of about 70 or 75*.It's as if the runways and objects float as you described.Can't do anything about as far as I know.Pete.